Infected Group Research Articles

Differential impact of Paenibacillus infection on the microbiota of Varroa destructor and Apis mellifera

The Western honey bee (Apis mellifera) is a vital agricultural pollinator whose populations are threatened by the parasitic mite Varroa destructor and associated pathogens. While the impact of Paenibacillus species on honey bees, particularly Paenibacillus larvae causing American foulbrood, is documented, their effect on the microbiota of Varroa mites remains unclear. This study aimed to investigate the influence of Paenibacillus sp. on the bacterial communities of Varroa mites and adult honey bees. We hypothesized that Paenibacillus sp. would significantly alter the microbiota of Varroa mites but have minimal effect on that of adult honey bees. Utilizing 16S rRNA sequencing data from a previous study, we reanalyzed samples categorized into four groups based on Paenibacillus sp. infection load: highly infected and lowly infected honey bees (A. mellifera) and mites (V. destructor). Infection status was determined by Paenibacillus sp. read counts, with more than three reads indicating high infection. Microbial diversity was assessed using alpha and beta diversity metrics. Co-occurrence networks were constructed to visualize bacterial community assemblies, and network robustness was evaluated through node addition and removal tests. Keystone taxa were identified based on eigenvector centrality and relative abundance. Highly infected Varroa mites exhibited a significant reduction in alpha diversity and a markedly different bacterial community composition compared to lowly infected mites (p < 0.05). Their bacterial co-occurrence networks showed decreased connectivity and robustness, indicating a disruptive effect of Paenibacillus sp. In contrast, adult honey bees displayed no significant differences in alpha diversity or network structure between highly and lowly infected groups (p > 0.05), suggesting a resilient microbiota. Keystone taxa analysis revealed fewer central species in highly infected Varroa mites, potentially impacting network stability. High Paenibacillus sp. infection is associated with significant alterations in the microbiota of Varroa mites, disrupting bacterial communities and potentially affecting mite physiology. The microbiota of adult honey bees appears more robust against Paenibacillus sp. influence. These findings enhance our understanding of the complex interactions within the "honey bee–mite–microorganism" system and may inform future strategies for managing Varroa mite infestations and associated pathogens.

Dietary supplementary with ellagic acid improves the intestinal barrier function and flora structure of broiler chicken challenged with E. coli K88

Ellagic acid (EA) contributes to the immunity and anti-oxidant function of body, whereas there are few reports about its effect on the intestinal health and growth performance of broiler chickens. Hence, the present study was arranged to investigate the effect of dietary supplementary with EA on the intestinal barrier function and flora structure of broiler chickens challenged with Escherichia coli K88 (E. coli K88). A total of 216 healthy 1-day-old, Ross 308 broilers with uniform weight were randomly assigned into three treatment groups, six replicates in each group and twelve birds in each replicate. Broilers in the control (CTR) group and E. coli K88 infected group (ETEC) were fed with the basic diet, and 200 mg/kg EA was supplemented into the diet of the E. coli K88 infected group treated with EA (EAETEC). The animal trial had lasted for 42 days, and the outcomes showed that the ADG and ADFI during the animal trial, the jejunal villi height (VH) and the ratio of VH to crypt depth (CD) tended to be decreased with E. coli K88 treated (P< 0.05). Additionally, the level of serum diamine oxidase (DAO) and intestinal malondialdehyde (MDA) were elevated, the activity of intestinal total superoxide dismutase (T-SOD) and glutathione peroxidase (GSH-Px), the mRNA levels in jejunal claudin-1 and occludin were down-regulated with E. coli K88 treated as well as the transcription levels of ileal Mucin-2, aquaporin-3 (AQP-3) and Na+/H+ exchanger proteins-3 (NHE-3) (P< 0.05). In addition, E. coli K88 down-regulated the α-diversity index of cecal flora, the ratio of Bacteroidota to Firmicutes and the relative abundance of Barnesiella were up-regulated and it of Alistipes was descended with E. coli K88 treated (P< 0.05). Beyond that, the content of propionic acid in the cecal chyme was decreased and the amino acid metabolic pathways were inhibited with E. coli K88 challenged (P< 0.05). Additionally, there was a significant positive correlation between the relative abundance of Alistipes and the levels of butyric acid in the caecal chyme and the activity of GSH-Px in the intestine (P< 0.05). Interestingly, dietary supplementary with EA could reshape the intestinal flora structure and alleviate the above negative effects of E. coli K88 on broiler chickens. In conclusion, dietary supplementary with ellagic acid improved the intestinal barrier function and flora structure of broiler chickens challenged with E. coli K88.

Transcriptome signature of juvenile Litopenaeus vannamei cultured under different salinity levels in response to Vibrio harveyi infection

Although the widely cultured Litopenaeus vannamei is highly tolerant to varying salinity levels, the rapid fluctuation of abiotic and biotic factors due to climatic changes may become stressors to the shrimp's physiology, resulting in impaired immunity and increased disease susceptibility. This study aimed to investigate the combined effects of both factors towards L. vannamei at transcriptomic level. L. vannamei were cultured at three different salinity levels (5 ppt, 20 ppt and 30 ppt) for 60 days and were challenged with Vibrio harveyi. RNA-seq analysis was conducted on the hepatopancreas to assess the differential expressed genes (DEGs) in both control and V. harveyi infected groups. Our results revealed 5,725 DEGs was observed in shrimp reared at 5 ppt, 3,643 DEGs at 20 ppt and 1,560 DEGs at 30 ppt. Most DEGs were identified to be associated with osmoregulation and transport activities, immune and stress regulation, nutrient metabolism, growth, chitin binding, gonadal development, and metal ion binding and toxicity. We identified that shrimp cultured at intermediate salinity of 20 ppt exhibits the greatest immunity level after infection by V. harveyi, given that low salinity (5 ppt) may augment the free ion metal toxicity, resulting in higher disease susceptibility. Both V. harveyi and salinity stress function together or separately to activate a wide range of immune and stress regulatory genes, which could be potential candidate markers for future RNAi and knockdown research in developing efficient prophylactic management strategies for L. vannamei.

A comparative study between current and past Helicobacter pylori infection in terms of microalbuminuria in patients with type 2 diabetes

BackgroundThe prevalence of Helicobacter pylori (H. pylori) infection and its potential relationship to various diseases is currently a focus of attention. The aim of this study is to investigate the association between current and past H. pylori infections and elevated levels of microalbuminuria in type 2 diabetic patients.MethodsTwo hundred patients with type 2 diabetes mellitus were tested for the presence of H. pylori infection. They were divided into three groups: 52 had a current H. pylori infection, 38 had a past H. pylori infection, and 110 had no H. pylori infection. All study participants underwent assessments of plasma glucose levels, glycated hemoglobin (HbA1c), albuminuria levels, inflammatory markers such as erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP), as well as other relevant investigations.ResultsThe prevalence of H. pylori infection (current and past) was detected in 90 out of 200 diabetic patients (45%). There was no statistically significant difference between the three groups in terms of age, diabetes duration, family history of DM, family history of hypertension, residence, or dyspeptic symptoms, indicating that current or past infection with H. pylori has no association with these variables. The current H. pylori infection group showed the highest levels of inflammatory markers, ESR and CRP, which were significantly different from those in the non-infected group (p = 0.013 and p < 0.001, respectively). The median (IQR) of albuminuria levels in the current H. pylori infection group, the past H. pylori infection group, and the non-infected group were 125 (4.8–290), 7.6 (2.4–271), and 5.1 (1.2–173), respectively. The current H. pylori infection group showed the highest albuminuria level, which was significantly different from that of the non-infected group (p = 0.001).ConclusionThere might be an association between microalbuminuria levels, general inflammatory markers (ESR and CRP), and current H. pylori infection in type 2 diabetic patients.

Risk groups of HIV infection among the population of the Omsk region

The peculiarities of the course of the epidemic process of HIV infection, including the formation of certain risk groups by gender, age and social status, are relevant, as they allow the development of specific preventive measures. The aim is to identify risk groups for HIV infection among the population of the Omsk region in 1996–2023. Data from the main statistical reporting forms, the Federal Register of Persons Infected with the Human Immunodeficiency Virus, and the results of epidemiological investigations were used for the analysis. The analysis made it possible to establish the main trends in the development of the epidemic process of HIV infection in the Omsk region. The general trend of decreasing morbidity has been revealed, which coincides with that in the Russian Federation, primarily due to the large volume of preventive measures carried out. Changes in the characteristics of the risk groups of infection have been established — the contingents of injecting drug users and men who have sex with men, prevailing at an early stage of the epidemic, have been replaced by persons who became sexually infected from individuals of the opposite sex. At the same time, the proportion of infected women approached that of men. This entailed the risk of perinatal transmission of HIV infection. The introduction of mandatory screening for HIV infection markers in pregnant women and the implementation of antiretroviral prophylaxis has reduced the number of cases of perinatal infection of newborns to a minimum. An increase in the share of the rural population in the total structure of newly diagnosed people with HIV infection may indicate both lower awareness of this problem and shortcomings in the provision of medical care, its lower accessibility compared to the urban population. The prevalence in the structure of HIV-infected people who are not engaged in work indicates that the most socially unprotected contingents are involved in the epidemic process, as a rule, they are not ready to take care of their own health and the health of others, often leading an antisocial lifestyle. Thus, HIV infection in the Omsk region remains one of the priority epidemiological problems requiring the formation of an integrated approach to its solution. The conducted research made it possible to identify the main risk groups for HIV infection, in relation to which targeted preventive strategies should be applied.

Clinical profile of patients with surgical brain abscesses and etiology in a reference hospital.

The annual incidence of brain abscesses is 1-2% in developed countries and up to 8% in developing countries. Our aim was to describe the profile and etiological agents of patients with surgical brain infections according to their nosological diagnosis on admission, and to analyze whether the initial diagnosis influenced the neurological deficit at discharge. This was an observational study with convenience sampling. All surgical cases operated between January 2017 and February 2022 with a final diagnosis of an infectious process were included. Three groups were analyzed according to admission diagnosis: a) infection, b) neoplasia, and c) miscellaneous. The time before admission, final histological diagnosis, etiological agent, length of hospital stay, and secondary neurological deficits were investigated. Descriptive and comparative statistics were used. 24 cases, including 18 (75%) men and 6 (25%) women, of ages 19 to 61 years (average 43.7 years) were studied. Nosological diagnoses on admission were infection in 9 (37.5%) patients, cerebral neoplasia in 9 (37.5%) patients, and miscellaneous diagnoses in 6 (25%) patients. Among the miscellaneous, neoplastic, and infectious groups, 33.3%, 33.3%, and 22.2% of patients were discharged with some neurological deficits with overall neurological morbidity and mortality of 29.6% and 8%, respectively. The etiological agents were Mycobacterium tuberculosis (16.6%), Streptococcus sp. (13%), Morganella morganii (8.7%), Nocardia sp. (4.3%), Cryptococcus sp. (4.3%), and Klebsiella sp. (4.3%). Nosological diagnosis on admission did not influence the percentage of patients with neurological deficits in our study. Mycobacterium was the most frequent etiological agent.

Clinical characteristics, depression, anxiety, and stress of medical workers during the COVID-19 pandemic: a cross-sectional survey.

Coronavirus disease 2019 (COVID-19) has an extremely high infection rate. This study aimed to investigate emotional states and COVID-19 infection of medical workers during the self-management strategy to COVID-19. Questionnaires were collected via an online questionnaire platform from 20 December 2022 to 19 January 2023, including demographic characteristics, number of vaccine doses, COVID-19 test results, occupation, attendant situations of workers, clinical symptoms, disease duration, and the Depression, Anxiety and Stress Scale 21. A total of 748 complete questionnaires were collected. The average age of participants was 33.61 ± 8.94 years, and 79.55% participants were female. The proportion of anxiety was significantly higher in the infection group (52.32%) than in the non-infection group (28.45%) (p < 0.001), as was the proportion of stress (41.47% vs. 31.90%, p = 0.046). Medical students (odds ratios (OR) 0.54, 95% confidence interval (CI) 0.31-0.93) and other staff (OR 0.63, 95% CI 0.40-0.98) had a lower risk for depression than doctors (p = 0.024), and attendant and infective situations of workers was the risk factor for depression (p = 0.007). Occupation (p = 0.029) and infected workers (p = 0.001) were related to anxiety. Infected attendant workers had a higher risk for stress (OR 1.97, 95% CI 1.12-3.48) than uninfected attendant workers (p = 0.019). Most medical workers infected with COVID-19 had emotional disorders during the COVID-19 pandemic. Attention and useful measures are suggested to support medical workers.

The evaluation of the Theraputic Effect of Aqueous Extract of Aloe Vera on Entamoeba histolytica in Vivo

Ameobiasis caused by Entameoba spp. It is a zoonotic disease that is the most prevalent. Thus, the study was conducted to evaluate the anti-ameobiasis efficacy of aqueous Aloe vera extracts in comparison with metronidazole in laboratory mice. Stool samples were collected from patients attending in Al-karamah teching Hospital suffering from diarrhea from November 1, 2022 to February 29, 2023, and 15samples were examined for both sexes microscopic by using the lugols iodine Stain to detect infected the parasite's cysts , Isolation and purification by flotation with normal solution and preserved in potassium dichromate for the purpose of using it in causing infection in laboratory mice. The experimental study was conducted on groups of 35 mice by oral administration of parasite cysts within the range of 95 cyst / ml except for the negative control group that was drenched with physiological saline. The feces of mice inoculated with cysts of parasites were microscopically examined using the modified lugols iodine Stain, After the mice were divided into seven groups with the uninfected and untreated group kept as a healthy negative control. The first group which included 21 mice was treated after it was divided into three subgroups A, B, C for each secondary group 7 mice they were treated with aqueous extract of A.vera at different concentrations 50, 100, 150 mg/ml on the respectively, while the second group which included 21 mice on three groups A, B, and C was treated with aqueous extract of A.vera at the previous concentrations for three consecutive days for each concentration. The third group was treated with metronidazole at a concentration of mg/ ml, and the positive control group remained infected with the parasite and was not treated. After treatment a microscopic examination was performed by evaluating the excretion average of parasite cysts using a hematocytometer slide. There was a decrease in the shedding of fecal cysts in the groups treated with aqueous extract at different concentrations, reaching a complete stop when treating with the highest concentrations at the end of the treatment period. Where, the average of shedding of fecal parasite cysts of groups of mice at concentrations 50, 100, 150 mg/ml reached 18.20, 0.200, 0 cyst/ml respectively. while the avrage of shedding of cysts in the group treated with metronidazole reached 60.20 cyst/ml in comparison with the infected positive control group in which the number of cysts continued to increase to 14.863 cyst/ml at the end of the treatment period. The results of the therapeutic efficacy of A.vera extract showed percentages of 82%, 90%, 100% for the aqueous extract at concentrations 50, 100, 150 mg/ml, respectively, while the therapeutic efficacy of metranidazol reached 84% at the end of the treatment period

Toxicological evaluation of anti-cough herbal tea made from aqueous extracts of G. Kola, C. Citratus and B. pinnatum

Background: Herbal formulations currently contribute significantly to medical remedies with varying effects on health indices. Garcinia kola seeds, Cymbapogon citratus, and Bryophyllum pinnantum leaves are among the widely used in herbal formulations. Objectives: This study evaluated the toxicological effects of the ternary combination of these plant materials on some renal, hepatic, hematological and histological parameters of streptococci-infected white albino rats. Materials and Methods: Samples of Garcinia kola seeds, Cymbapogon citratus leaves, and Bryophyllum pinnantum leaves were sourced locally and authenticated by a taxonomist. Aqueous extract of the ternary combination comprising of 40% G. kola, 30% C. citratus, and 30% B. pinnantum was prepared and administered on albino rats. Thirty five white albino rats grouped into 7 groups comprising of normal control, treatment control, disease control, and test group were used for the evaluation after a 14 days treatment on infected and uninfected rats. The rats were sacrificed, and samples collected. Some renal, hepatic, histological, and hematological indices were analyzed. Results: Comparison of all hematological parameters (except for platelet count) between uninfected-untreated and unifected-treated with extract showed no significant (p&gt;0.05) difference. Platelet count was significantly (p&lt;0.05) raised in all groups treated with the extract. Comparison control and the extract-treated group showed no significant (p&gt;0.05) difference in renal parameters indicating no adverse effects on renal function. However, comparison of parameters between control and the infected-treated group showed significantly elevated creatinine which alone may not be sufficient to support renal damage. Albumin, and total bilirubin were significantly (p&lt;0.05) lower in the extract-treated group compared to the control group. In contrast, total protein and globulin were significantly (p&lt;0.05) higher in the controls to the infected groups. ALT and AST were significantly (p&lt;0.05) lower in the extract treated groups compared to the control group. Although comparison of ALP activity between uninfected-untreated and infected-treated group showed significant (p&lt;0.05) elevation this alone may not be sufficient to support liver damage. The hematoxyline and eosine stained sections of the kidney and the liver tissues of the tea fed groups show normal kidney and liver histology. There was no significant change in the liver and kidney histology of the test and control groups. The extract did not cause adverse impact on these organs. Conclusion: Ternary combination of 40% G. kola, 30% C. citratus, and 30% B. pinnantum can effectively be used in treatment of cough without significant adverse effects on renal, hepatic, hematological and histological parameters. The ternary combination rather demonstrated significant hepato-protective feature.

Levels of Matrix Metalloproteinase-9 (MMP-9) and its gene polymorphism of Hydatid Cyst Disease in an Infected Patients

Hydatid cystic disease is an economic burden in Iraq since it decreases the productivity of sheep, goats, cows, and camels by making the organs unpalpable for human consumption, hence weight-loss and ill health. This is one of the most common zoonosis diseases shared between human beings and animals and appears in man hosts inlcuded some organes, such as liver and lung as hydatid cyst . it causes many complications that may lead to death in repured parasites. Now there are no safe and effective in the fight against this parasite, and the search for such medications is in research. The Matrix Metalloproteinase-9 is a one of the enzymes that belong to the family of matrix metalloproteinases (MMPs), which play a crucial role in the proteolytic degradation of the extracellular matrix (ECM). These enzymes have a zinc ion in the active site that is important for their proteolytic activity. MMP-9, also known as Gelatinase B, catalyzes gelatin and degrades components of the ECM, including abundant type IV collagen in basement membranes. MMP-9 plays an important role in various biological processes, including tissue remodeling, angiogenesis, and tissue inflammation. The objective of the study is to determine the impact of MMP-9 serum levels and specific single nucleotide polymorphisms (SNPs) rs17576 and rs76070157 on patients with hydatid disease, in comparison to a control group of healthy individuals. A total of (62) patients diagnosed with hydatid disease, consisting of 18 males and 44 females, were compared to a control group of(75) individuals, comprising 29 males and 46 females .The study examined the MMP-9 rs17576 and rs76070157 )SNPs( in patients with hydatid disease, comparing them to a control group of healthy individuals. The study revealed no statistically significant difference in the average age between the two groups at a significance level of 0.05. Additionally, the study found higher concentrations of MMP-9 in the sera of the infected group (20.40 ± 1.52 pg/µl) compared to the control group (19.49 ± 1.62 pg/µl). The rs17576 )SNPs( data indicated that the TT genotype and T allele exhibited a slightly higher frequency percentage in the group of patients with hydatid disease compared to the healthy group, however this difference was not statistically significant. The values are (98.4% and 99.0%) the value of pc is 0.001. The elevated odds ratio (OR) associated with the TT genotype and T allele may serve as a potential risk factor for hydatid disease. The rs17576 SNPs displayed genotypes that were not in accordance with Hardy-Weinberg equilibrium. However, these genotypes were consistent with those observed in a control group. The GG genotype showed a significant increase in frequency compared to the control group (100.0% vs. 100.0%), while the G allele exhibited a non-significant increase in frequency. The odds ratio (OR) for the TG genotype was 3.68, and the p-value (pc) was 0.05.Elevated value could potentially increase the risk of hydatid disease. The presence of the TG genotype was shown to considerably increase the frequency percentage in the group of patients with hydatid disease. The odds ratio (OR) value of 1.6 suggests that it may be a risk factor for hydatid disease, with a frequency of 98.4% compared to 0.99 % in the control group. The p-value of 0.001 indicates a statistically significant association. The GG genotype was present in (0%) of the affected group but absent (100.0%) in the healthy group. The odds ratio (OR) of 3.68, with a p-value of 0.001, suggests that the GG genotype is associated with a significantly lower risk of hydatid disease.

Host miRNA and mRNA profiles during in DEF and duck after DHAV-1 infection

DHAV-1 is a highly infectious pathogen that can cause acute hepatitis in ducklings. MicroRNA (miRNA) plays an essential regulatory role in virus response. We characterized and compared miRNA and mRNA expression profiles in duck embryonic fibroblasts (DEF) and the liver of ducklings infected with DHAV-1. DHAV-1 infected DEF was divided into infection group (D group) and blank group (M group), and DHAV-1 infected duckling group was divided into infection group (H group) and blank group (N group). D vs. M have 130 differentially expressed (DE) miRNA (DEM) and 2204 differentially expressed (DE) mRNA (DEG), H vs. N have 72 DEM and 1976 DEG. By the intersection of D vs. M and H vs. N comparisons, 15 upregulated DEM, 5 downregulated DEM, 340 upregulated DEG and 50 downregulated DEG were found with both in vivo and in vitro DHAV-1 infection. In particular, we identified the same DE miRNA target genes and functional annotations of DE mRNA. We enriched with multiple gene ontology (GO) and the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways, which may have important roles in viral virulence, host immunity, and metabolism. We selected miR-155, which is co-upregulated, and found that miR-155 targets SOCS1 to inhibit DHVA-1 replication.

Association of long-term use of low-dose aspirin with Helicobacter pylori infection and effect on recurrence rate.

To investigate the relationship between long-term use of low-dose aspirin and Helicobacter pylori (HP) infection, and its effect on eradication and recurrence of HP. According to the results of C14-Urea Breath Test (C14-UBT), 3256 patients with cardiovascular and cerebrovascular diseases from March 2019 to December 2020, were divided into HP infection group and non-infection group. Univariate and multivariate was used to investigate the relationship between Low-dose aspirin use and HP infection. 859 patients with hypertension combined with HP infection were divided into aspirin group, non-aspirin group and control group, the eradication rate after 2 weeks of bismuth-containing quadruple drug treatment and the recurrence rate after 1,3 year were compared. The overall infection rate of HP was 53.3%. The results of univariate analysis showed that the infection rate of female, age, BMI, LDL-C, FBG of HP infected group was higher than non-infection. The infection rate of patients who took low-dose aspirin was higher than no-aspirin [56.6% vs. 51.3%, χ2 = 8.548, P = 0.003]. Multivariate Logistic regression analysis showed that long-term aspirin use still increased the risk of infection (OR = 1.433, 95% CI 1.196-1.947, P < 0.001). The Per-Protocol analysis showed that the overall eradication rate was 87.6%, and among the eradication rates of aspirin group, non-aspirin group and control group were not statistically significantly (87.8%, 88.5%, and 86.6%, respectively), The Intention-To-Treat analysis showed that the overall eradication rate was 84.3%, and the eradication rates among the three groups were not statistically significantly. The overall 1-year recurrence rate was 1.3%, and the recurrence rates of the three groups were no statistical significance. The overall 3-years recurrence rate was 3.1%, and the recurrence rate of aspirin group was higher than non-aspirin group and control group (5.30%, 1.90% and 1.70%, respectively, χ2 = 6.118, P < 0.05). The main adverse reactions in the first month of eradication treatment were constipation and mild nausea, and there was no statistical significance between the three groups. Long-term use of low-dose aspirin increases the risk of HP infection and the recurrence rate in 3 years after eradication. It is suggested that HP should be tested and eradicated regularly in long-term users.

Unpredictable Repeated Stress in Rainbow Trout (Oncorhynchus mykiss) Shifted the Immune Response against a Fish Parasite.

Farmed fish are regularly subjected to various stressors due to farming practices, and their effect in the context of a disease outbreak is uncertain. This research evaluated the effects of unpredictable repeated stress in rainbow trout challenged with the ciliate Ichthyophthirius multifiliis, known to cause white spot disease in freshwater fish. Before and after the pathogen exposure, fish were handled with a random rotation of three procedures. At 7 days post-infection (dpi), the parasite burden was evaluated in fish and in the tank's water, and the local and systemic immune responses were investigated in the gill and spleen, respectively. The fish mortality was recorded until 12 dpi, when all the fish from the infected groups died. There was no statistical difference in parasite burden (fish and tank's water) and infection severity between the two infected fish groups. The immune gene expression analysis suggested a differential immune response between the gill and the spleen. In gills, a T helper cell type 2 immune response was initiated, whereas in spleen, a T helper cell type 1 immune response was observed. The stress has induced mainly upregulations of immune genes in the gill (cat-1, hep, il-10) and downregulations in the spleen (il-2, il-4/13a, il-8). Our results suggested that the unpredictable repeated stress protocol employed did not impair the fish immune system.

Peripherally-restricted recurrent infection by engineered E. coli strain modulates hippocampal proteome promoting memory impairments in a rat model

Commensal bacteria that breach endothelial barrier has been reported to induce low grade chronic inflammation producing disease symptoms in major peripheral tissues. In this study, we investigated the role of genetically modified cellular invasive form of commensal E. coli K12 (SK3842) in cognitive impairment. Low-grade systemic infection model was developed using recurring peripheral inoculation of live bacteria in Wistar rats. To examine memory parameters, Novel object recognition test and Radial arm maze test were performed. Differential protein expression profiling of rat hippocampus was carried out using LC-MS/MS and subsequently quantified using SWATH. HBA1/2, NEFH, PFN1 and ATP5d were chosen for validation using quantitative RT-PCR. Results showed drastic decline in Recognition memory of the SK3842 infected rats. Reference and Working Memory of the infected group were also significantly reduced in comparison to control group. Proteome analysis using LC-MS/MS coupled with SWATH revealed differential expression of key proteins that are crucial for the maintenance of various neurological functions. Moreover, expression of NEFH and PFN1transcripts were found to be in line with the proteomics data. Protein interaction network of these validated proteins generated by STRING database converged to RhoA protein. Thus, the present study establishes an association between peripheral infection of a hippocampal protein network dysregulation and overall memory decline.

Antibody response to SARS-CoV-2 natural and breakthrough infection in patients undergoing maintenance hemodialysis: A prospective cohort study over 4 months

BackgroundPatients undergoing maintenance hemodialysis (MHD) are susceptible to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. However, the antibody response of these patients to natural and breakthrough infections remains poorly understood. MethodsBetween January 15, 2023, and February 15, 2023, a total of 53 patients undergoing MHD and diagnosed with SARS-CoV-2 infection at The Affiliated Hospital of Hangzhou Normal University were enrolled. They were categorized into the natural (n = 40) and breakthrough infection groups (n = 13) based on their vaccination status before infection. Comprehensive data, including basic clinical information, vaccination status, and routine post-infection blood parameters, were collected from all participants. Blood specimens were drawn monthly after infection, and SARS-CoV-2 receptor-binding domain (RBD) immunoglobulin (Ig) G and IgM tests were conducted. The study included continuous follow-up over 4 months. ResultsDuring the acute phase of infection, the SARS-CoV-2 RBD IgM positivity was 5 % in patients undergoing MHD who were naturally infected and 15.4 % in those with breakthrough infections. Four months after infection, SARS-CoV-2 RBD IgG positivity in patients with natural and breakthrough infection was 77.5 % and 100 %, respectively. Patients undergoing MHD with breakthrough infection exhibited higher SARS-CoV-2 RBD IgG titers (751.21 signal-to cutoff ratio, S/CO [interquartile range, IQR, 30.54–1173.63]) than those with natural infections (3.43 S/CO [IQR, 1.12–15.6]) (p < 0.0001). No significant differences were observed in SARS-CoV-2 RBD IgG between males and females or among those aged <70 and ≥70 years. Patients who received three doses of the inactivated vaccine produced significantly higher SARS-CoV-2 RBD IgG levels after infection than those who received one or two doses; these differences were significant. ConclusionsAlthough patients undergoing MHD exhibit a low rate of SARS-CoV-2 RBD IgM positivity following infection, those vaccinated with inactivated vaccines can generate elevated SARS-CoV-2 RBD IgG levels, particularly those who receive three doses.

Clinical characteristics and prognostic factors of pulmonary and extrapulmonary cryptococcosis

BackgroundCryptococcosis is progressively acknowledged among people, irrespective of the human with or without immunodeficiency virus (HIV). This change in epidemiology has been recorded in recent years, prompting closer examination and a broader understanding of the disease manifestations and risk factors.MethodsThe data of cryptococcal infections in China during 11 years were retrospectively analyzed. According to the position of infection, the patients were categorized into the pulmonary infection group and extrapulmonary infection group. The composition of the two groups was compared, and the potential risk factors of disseminated infection were analyzed. Logistic regression was used to analyze the prognostic risk factors of the disease.ResultsA total of 165 patients were enrolled. 113 (68.5%) were male, and the age was 47.49 (18–82) years. 101 cases (61.2%) had a normal immune function and 64 cases (38.8%) had impaired immune function. 45 patients had extrapulmonary infection, involving the central nervous system, bone and joint, skin and bloodstream, and 120 patients had simple pulmonary infection. The mortality of the extrapulmonary infection group (48.9%) was significantly higher than that of the pulmonary infection group (0.8%). According to univariate logistic regression analysis, immune status (hazard ratio [HR], 4.476; 95% confidence interval [CI], 1.725–11.618; P = 0.002), infection position ([HR], 113.826; [CI], 14.607-886.967; P < 0.001), white blood cell count, ([HR],1.209;[CI], 1.054–1.386; P = 0.007), hemoglobin ([HR], 0.970; [CI], 0.955–0.986; P < 0.001), platelet count ([HR], 0.993; [CI], 0.987–0.999; P = 0.026), neutrophil percentage ([HR], 1.115; [CI], 1.065–1.168; P < 0.001), lymphocyte percentage ([HR], 0.875; [CI], 0.827–0.927; P < 0.001), neutrophil-to-lymphocyte Ratio (NLR) ([HR], 1.144; [CI], 1.072–1.221; P < 0.001), monocyte percentage ([HR], 0.752; [CI], 0.618–0.915; P = 0.004) were related to the prognosis. Multivariate logistic regression analysis showed that the infection position was remained related to the prognosis with statistical significance ([HR], 0.018; [CI], 0.001–0.384; P = 0.001).ConclusionExtrapulmonary infection of Cryptococcosis is an important risk factor for prognosis. High levels of neutrophils and NLR, and low levels of lymphocytes and monocytes may lead to disseminated infection of Cryptococcosis. Further studies are needed to reduce the occurrence rate of extrapulmonary infection and mortality.

Pumpkin seed oil: unveiling its potential in controlling inflammation and pathogenicity during experimental trichinellosis

BackgroundThis study aimed to investigate the antiparasitic and anti-inflammatory potential of pumpkin seed oil in mice infected with Trichinella spiralis by demonstrating its impact on MMP-9 expression and pathogenesis during the intestinal and muscular phases.ResultsIn this study, 100 mice were divided into five groups: an infected group, a pumpkin seed oil-treated group (1.5 mg/kg BW, administered three times per week), an albendazole-treated group, a native control group, and a pumpkin oil control group. Gas chromatography–mass spectrometry analysis of the pumpkin seed oil revealed a broad spectrum of biologically active compounds. The pumpkin seed oil treatment led to a significant reduction in the parasite burden, with a 75% decrease in adult worms and a 66% decrease in encysted larvae. Additionally, the infected animals treated with pumpkin oil exhibited a marked reduction in intestinal inflammation, characterized by a progressive increase in goblet cells. The number of encysted larvae in the diaphragm and muscle tissues was also significantly decreased. Furthermore, pumpkin seed oil treatment significantly reduced MMP-9 levels in both intestinal and muscular tissues, highlighting its potential to attenuate inflammation.ConclusionThese findings underscore the effectiveness of pumpkin seed oil as anti-inflammatory and antiparasitic agent.

High abundance of butyrate-producing bacteria in the naso-oropharynx of SARS-CoV-2-infected persons in an African population: implications for low disease severity

BackgroundThe association of the oral microbiome with SARS-CoV-2 infections and disease progression has been documented in European, Asian, and American populations but not in Africa.MethodsWe conducted a study in Ghana to evaluate and compare the naso-oropharyngeal microbiome in SARS-CoV-2-infected and uninfected persons before (pre-vaccine) and after vaccine availability (post-vaccine) in the country. 16S rRNA V3-V4 variable region was sequenced and analysed from DNA extracted from naso-oropharyngeal swabs.ResultsConsidering only the infection status, infected and uninfected groups had no difference in their within-group diversity and was evident in the study population pre- and post-vaccine availability. The introduction of vaccines reduced the diversity of the naso-oropharyngeal microbiome particularly among SARS-CoV-2 positive persons and, vaccinated individuals (both infected and uninfected) had higher microbial diversity compared to their unvaccinated counterparts. SARS-CoV-2-positive and -negative individuals were largely compositionally similar varying by 4–7% but considering vaccination*infection statuses, the genetic distance increased to 12% (P = 0.003) and was mainly influenced by vaccination. Common among the pre- and post-vaccine samples, Atopobium and Finegoldia were abundant in infected and uninfected individuals, respectively. Bacteria belonging to major butyrate-producing phyla, Bacillota (particularly class Clostridia) and Bacteroidota showed increased abundance more strikingly in infected individuals before vaccines were available. They reduced significantly after vaccines were introduced into the country with Fusobacterium and Lachnoanaerobaculum being the only common bacteria between pre-vaccine infected persons and vaccinated individuals, suggesting that natural infection and vaccination correlate with high abundance of short-chain fatty acids.ConclusionOur results show, in an African cohort, the abundance of bacteria taxa known for their protective pathophysiological processes, especially during infection, suggesting that this population is protected against severe COVID-19. The immune-related roles of the members of Bacillota and Bacteroidota that were found associated with infection and vaccination require further studies, and how these may be linked to ethnicity, diet and age. We also recommend expansion of microbiome–disease association studies across Africa to identify possible bacterial-mediated therapeutics for emerging infections.

Comprehensive analysis of risk factors for postoperative wound infection following open reduction and internal fixation of Rib fractures

BackgroundPostoperative wound infections (PWIs) significantly impact patient outcomes following open reduction and internal fixation (ORIF) of rib fractures. Identifying and understanding risk factors associated with these infections are crucial for improving surgical outcomes and patient care.MethodsThis retrospective study, conducted from January 2020 to October 2023 at our institution, aimed to analyze the risk factors for PWIs in patients undergoing ORIF for rib fractures. A total of 150 patients were included, with 50 in the infected group and 100 in the non-infected control group, matched for demographic and clinical characteristics. Data on variables such as intraoperative blood loss, hospital stay duration, body mass index (BMI), operation time, presence of anemia, drainage time, diabetes mellitus status, smoking habits, and age were collected. Statistical analysis involved univariate and multivariate logistic regression using SPSS software (Version 27.0), with p-values < 0.05 considered statistically significant.ResultsUnivariate analysis revealed no significant association between intraoperative blood loss or hospital stay duration and PWIs. However, operation time ≥ 5 h, anemia, drainage time ≥ 7 days, diabetes mellitus, smoking, and age ≥ 60 years were significantly associated with higher PWI rates. Multivariate logistic regression confirmed these factors as independent predictors of PWIs, with operation time and diabetes mellitus showing particularly strong associations.ConclusionsProlonged operation time, anemia, extended drainage, diabetes mellitus, smoking, and advanced age significantly increase the risk of PWIs following ORIF for rib fractures. Early identification and targeted management of these risk factors are essential to reduce the incidence of infections and improve postoperative outcomes.

Acetylsalicylic acid and dihydroartemisinin combined therapy on experimental malaria-associated acute lung injury: analysis of lung function and the inflammatory process

BackgroundSevere malaria can cause respiratory symptoms, which may lead to malaria-acute lung injury (MA-ALI) due to inflammation and damage to the blood-gas barrier. Patients with severe malaria also often present thrombocytopenia, and the use of acetylsalicylic acid (ASA), a commonly used non-steroidal anti-inflammatory drug with immunomodulatory and antiplatelet effects, may pose a risk in regions where malaria is endemic. Thus, this study aimed to investigate the systemic impact of ASA and dihydroartemisinin (DHA) on ALI induced in mice by Plasmodium berghei NK65 (PbNK65).MethodsC57BL/6 mice were randomly divided into control (C) and PbNK65 infected groups and were inoculated with uninfected or 104 infected erythrocytes, respectively. Then, the animals were treated with DHA (3 mg/kg) or vehicle (DMSO) at the 8-day post-infection (dpi) for 7 days and with ASA (100 mg/kg, single dose), and analyses were performed at 9 or 15 dpi. Lung mechanics were performed, and lungs were collected for oedema evaluation and histological analyses.ResultsPbNK65 infection led to lung oedema, as well as increased lung static elastance (Est, L), resistive (ΔP1, L) and viscoelastic (ΔP2, L) pressures, percentage of mononuclear cells, inflammatory infiltrate, hemorrhage, alveolar oedema, and alveolar thickening septum at 9 dpi. Mice that received DHA or DHA + ASA had an increase in Est, L, and CD36 expression on inflammatory monocytes and higher protein content on bronchoalveolar fluid (BALF). However, only the DHA-treated group presented a percentage of inflammatory monocytes similar to the control group and a decrease in ΔP1, L and ΔP2, L compared to Pb + DMSO. Also, combined treatment with DHA + ASA led to an impairment in diffuse alveolar damage score and lung function at 9 dpi.ConclusionsTherapy with ASA maintained lung morpho-functional impairment triggered by PbNK65 infection, leading to a large influx of inflammatory monocytes to the lung tissue. Based on its deleterious effects in experimental MA-ALI, ASA administration or its treatment maintenance might be carefully reconsidered and further investigated in human malaria cases.