Virus Status Research Articles

Host Genetic Variation Impacts SARS-CoV-2 Vaccination Response in the Diversity Outbred Mouse Population.

The COVID-19 pandemic led to the rapid and worldwide development of highly effective vaccines against SARS-CoV-2. However, there is significant individual-to-individual variation in vaccine efficacy due to factors including viral variants, host age, immune status, environmental and host genetic factors. Understanding those determinants driving this variation may inform the development of more broadly protective vaccine strategies. While host genetic factors are known to impact vaccine efficacy for respiratory pathogens such as influenza and tuberculosis, the impact of host genetic variation on vaccine efficacy against COVID-19 is not well understood. To model the impact of host genetic variation on SARS-CoV-2 vaccine efficacy, while controlling for the impact of non-genetic factors, we used the Diversity Outbred (DO) mouse model. We found that DO mice immunized against SARS-CoV-2 exhibited high levels of variation in vaccine-induced neutralizing antibody responses. While the majority of the vaccinated mice were protected from virus-induced disease, similar to human populations, we observed vaccine breakthrough in a subset of mice. Importantly, we found that this variation in neutralizing antibody, virus-induced disease, and viral titer is heritable, indicating that the DO serves as a useful model system for studying the contribution of genetic variation of both vaccines and disease outcomes.

Hepatitis B Virus Status and Clinical Outcomes in IgA Nephropathy

Immunoglobulin A nephropathy (IgAN) has been reported to coexist with hepatitis B virus (HBV) infection. Despite the clinical significance of this association, there is a lack of comprehensive research investigating the impact of various common conditions following HBV infection and the potential influence of anti-HBV therapy on the progression of IgAN. We investigated 3 distinct states of HBV infection, including chronic HBV infection, resolved HBV infection, and the deposition of hepatitis B antigens in renal tissue, in a follow-up database of 1961 patients with IgAN. IgAN progression was defined as a loss of estimated glomerular filtration rate (eGFR) >40%. Multivariable cause-specific hazards models to analyze the relationship between HBV states and IgAN progression. Chronic HBV infection was identified as an independent risk factor for IgAN progression, supported by both prematching analysis (hazard ratio [HR], 1.61; 95% confidence interval [CI], 1.06-2.44; P= 0.024) and propensity-score matching analysis (HR, 1.74; 95% CI 1.28-2.37; P< 0.001). Conversely, resolved HBV infection showed no significant association with IgAN progression (HR, 1.01; 95% CI 0.67-1.52; P= 0.969). Moreover, the presence of HBV deposition in the kidneys and the utilization of anti-HBV therapy did not appear to be significant risk factors for renal outcomes (P > 0.05). Chronic HBV infection is an independent risk factor for IgAN progression, whereas resolved HBV infection is not. In patients with IgAN, management of concurrent chronic HBV infection should be enhanced. The presence of HBV deposition in the kidneys and the use of anti-HBV medications do not impact the kidney disease progression in patients with IgAN with concurrent HBV infection.

Congenital heart surgery outcomes in patients with positive respiratory viral swabs

ObjectiveTo examine whether or not viral positive patients experienced worse outcomes and assess differences in surgical outcomes between viral-positive patients with and without viral symptoms within 30 days of surgery. MethodsThis retrospective study reviewed charts of pediatric patients who underwent congenital heart surgery and routine viral testing at a single institution over a consecutive 3-year period (2017-2019). Patients with a history of heart transplants, pacemaker changes, or implants, and mediastinal washouts were excluded from the study. Surgical outcomes were compared by viral status and viral symptoms, using the Fisher exact and Wilcoxon rank sum tests. ResultsAmong 1041 patients, 374 patients underwent routine preoperative viral testing, with 107 patients testing positive and 267 testing negative for viral swabs before surgery. There were no significant differences observed in surgical outcomes by viral status, including no differences in mortality. Among the 107 patients with positive viral swabs before surgery, comparisons between 24 patients with viral symptoms and 83 without symptoms within 30 days of surgery detected no significant differences in mortality or complication rates. However, symptomatic versus asymptomatic patients had significantly longer postoperative stay (23.4 vs 13.4 days; P = .02) and intubation time (9.8 vs 4.9 hours; P = .004). ConclusionsPatients who test positive before congenital heart surgery and are asymptomatic beyond the incubation period may proceed to surgery with no further delay. Patients who are viral positive and symptomatic have a longer postoperative stay and intubation time. A prospective study is needed to assess the importance of routine viral testing.

Demographic and Clinical Characteristics of Kidney Donors at First Check: A Single-Center Experience.

Kidney transplant is the best treatment for patients with end-stage kidney disease. In many regions of the world, including the Middle East, most kidney transplants are from living donors. In contrast to recipients, data for living donors remain scarce. Here, we describe living donor baseline characteristics at first hospital check at a single center in Baghdad, Iraq. We collected and analyzed demographic, laboratory, imaging, and histocompatibility data from donor records at the Nephrology and Renal Transplantation Center, Medical City-Baghdad, Baghdad, Iraq, from July 2022 to September 2022. We included 124 kidney donors (56.4% male) who donated their kidneys 1 to 3 years previous to our study, with a mean age of 34.84 ± 10.04 years and mean body mass index (weight in kilograms divided by height in meters squared) of 27.11 ± 2.12. Most donors donated their kidneys to a firstdegree relative (69.2%); blood group O was the most prevalent (47.5%). More than half of the donors were unemployed. Histocompatibility testing showed that 40% of the donors had >3 human leukocyte antigen mismatches with their recipients, and 30% of the recipients were high-risk sensitized patients with a calculated panel reactive antibody >50%. Regarding the virus status, 68.5% of the donors tested positive for cytomegalovirus immunoglobulin G, 8% of the transplants were high-risk cytomegalovirus status, and 43.5% tested positive for Epstein-Barr virus immunoglobulin G. Renal imaging showed that 75.8% of donors had a single artery and 24.1% had a double artery (26.6% double left, 40% double right, and 33.3% both). For living transplant procedures at a single center in Iraq, most were from related donors. Most donors are unemployed, which mandates future health and social support. High immunological and viral risks must not be ignored in a single center with living related donors.

Práticas de biosseguridade associadas com infecção do vírus da diarreia viral bovina em rebanhos leiteiros no Brasil

ABSTRACT: This study determined the association between biosecurity practices and the status of bovine viral diarrhea virus (BVDV) in dairy production systems. Approximately 280 herds were screened for BVDV virus detection. Following the screening, 68 herds were selected to identify individual BVDV PI animals using an ear notch biopsy and ELISA-antigen. All offspring of the last generation were tested, and the maternal lineage of positive cases was examined. A questionnaire on BVDV biological risk assessment was completed. A multiple correspondence analysis (MCA) was conducted to determine the association between herds with or without BVDV circulation and biosecurity practices. The MCA revealed that farms with virus circulation lacked knowledge about the disease and wrongly perceived their herds as protected, while farms without virus circulation were aware of the disease but considered their herds unprotected. Vaccination practices differed between positive and negative herds, with positive herds using vaccines only for reproductive diseases and negative herds vaccinating for respiratory and reproductive issues. Biosecurity practices such as frequent visitation, contact between animals of different ages, and annual introduction of new animals were linked to viral circulation, while virus-free herds implemented measures like controlled visitation, no contact between different age groups, and quarantine. Lastly, herds with virus circulation acquired pregnant females without prior testing. This study emphasized the crucial role of biosecurity practices in controlling BVDV in dairy herds. It highlighted the sharper risk perception and better application of biosecurity practices in negative herds compared to BVDV-positive herds.

Relationship between coping styles (problem-oriented, emotion-oriented, and avoidance-oriented) with psychological well-being in people with coronavirus-2019 experience in Kermanshah city

BACKGROUND: Considering the epidemic status of the COVID-19 virus, the discussion of the psychological effects of this disease on the mental health of people at different levels of society is of great importance. Therefore, this study was conducted to investigate the relationship between coping (problem-oriented, emotion-oriented, and avoidance-oriented) with psychological well-being in people with coronavirus disease. MATERIALS AND METHODS: In this correlational study, the statistical population consisted of all individuals with experience of coronavirus in 2021 in Kermanshah city. In total, 220 people were selected as the sample using an available sampling method. The instruments used in this study were Reef Psycho-Welfare Questionnaire (PWBQ) and Andler and Parker Coping Styles (CISS-SF). Data were analyzed using Pearson’s correlation coefficient and simultaneous regression. RESULTS: Multiple correlations of coping variables (problem-oriented, emotion-oriented, and avoidance-oriented) with psychological well-being (R = 0.671; P = 0.01) are significant. Problem-oriented coping style (beta = 0.329; P = 0.05), emotional coping style (beta = 0.329; P = 0.05); avoidant coping style (beta = 0.144; P = 0.05) had a significant relationship with psychological well-being. CONCLUSION: According to the obtained results, the importance of paying attention to coping styles in psychological well-being is felt more than before. Psychological well-being seems to be influenced by other factors and their interactive effects as well.

Variability in indigenous Pakistani tomato lines and worldwide reference collection for Tomato Mosaic Virus (ToMV) and Tomato Yellow Leaf Curl Virus (TYLCV) infection.

Local and exotic germplasm of tomato remains a major source for genetic improvement. Assessment of such lines for biotic stresses particularly viral diseases are the most important criteria for selection in Pakistan, where Tomato Yellow Leaf Curl Virus (TYLCV) and Tomato Mosaic Virus (ToMV) are the major diseases/viruses. A set of 40 accessions (including indigenous Pakistani lines and exotic germplasm from Europe, the United States, and Asia) were evaluated for their resistance/infection response to ToMV with artificial inoculation under greenhouse conditions. Infection response was quantified through disease scoring and DAS-ELISA test (for ToMV). A subset of 24 lines, was further screened for TYLCV using disease scoring and TAS-ELISA. The tested lines showed significant variability for resistance to ToMV. Only one accession (Acc-17878) was resistant to the ToMV whereas seven accessions i.e. Acc-17890, AVR-261, CLN-312, AVR-321, EUR-333, CLN-352, and CLN-362 expressed resistance to TYLCV. Correlation between phenotypic evaluation was confirmed by the ELISA results in both diseases, although both tools complemented to assess the viral infection status. In future, tomato breeding programs must consider breeding for ToMV and TYLCV resistance (using identified germplasm in our study) so as to deliver virus resistant tomato varieties.

Accuracy of Provider Predictions of Viral Suppression Among Adolescents and Young Adults With HIV in an HIV Clinical Program.

Providers caring for adolescents and young adults with HIV (AYA-HIV) mostly base their adherence counseling during clinical encounters on clinical judgment and expectations of patients' medication adherence. There is currently no data on provider predictions of viral suppression for AYA-HIV. We aimed to assess the accuracy of provider predictions of patients' viral suppression status compared to viral load results. Providers caring for AYA-HIV were asked to predict the likelihood of viral suppression of patients before a clinical encounter and give reasons for their predictions. Provider predictions were compared to actual viral load measurements of patients. Patient data were abstracted from electronic health records. The final analysis included 9 providers, 28 patients, and 34 observations of paired provider predictions and viral load results. Provider prediction accuracy of viral suppression was low (59%, Cohen's Kappa = 0.16). Provider predictions of lack of viral suppression were based on nonadherence to medications, new patient status, or structural vulnerabilities (e.g., unstable housing). Anticipated viral suppression was based on medication adherence, history of viral suppression, and the presence of family or other social forms of support. Providers have difficulty accurately predicting viral suppression among AYA-HIV and may base their counseling on incorrect assumptions. Rapid point-of-care viral load testing may provide opportunities to improve counseling provided during the clinical encounter.

Etiologic Profile of the Pneumococcus in Ghana: A Systematic Review.

Objective: To describe the profile of Streptococcus pneumoniae, identify research gaps, and provide in-depth insights into various aspects related to the pathogen. Methods: Google Scholar, PubMed, and ScienceDirect were searched for all studies on the pneumococcus in Ghana that reported on specimen collected, population and sample size, carriage prevalence, incidence of pneumococcal diseases, age of the study population, types of test performed, serotypes identified, antimicrobial susceptibilities, or molecular analysis on the pneumococci for data extraction. Results: Overall, a total of 7954 results were obtained from the three-database search, and of this, 24 articles were selected after screening. A total of 924 isolates were accounted for by serotyping/serogrouping. The prevalence of pneumococcal carriage in Ghana ranges from 11.0% to 51.4% in the population depending on the age (≤ 24-80 years), sickle cell disease (SCD), human immunodeficiency virus (HIV) status, or health of the study population, and penicillin (Pen)-nonsusceptible isolates ranged from 17% to 63%. The prevalence of pneumococci found as the etiologic agent of diseases among Ghanaians ranges from 3.4% for otitis media to 77.7% for meningitis. Overall, the 13-valent pneumococcal conjugate vaccine (PCV) (PCV-13) carriage serotypes accounted for 28.4% of the reported pneumococcal isolates. PCV-13 invasive serotypes accounted for 22.4% of the reported isolates. The non-PCV-13 carriage serotypes accounted for most (43.9%) of the reported isolates. In the pre-PCV-13 era, the nontypeable (NT) (5.5%) and other nonvaccine types (NVTs) (6.4%) were reported as being predominant. The non-PCV-13 serotypes accounted for 4.4% of the reported isolates in invasive pneumococcal disease (IPD) cases. Multidrug resistance (MDR) ranged from 7.8% to 100%. Conclusion: Predicting the invasiveness of pneumococci using molecular typing is the way to go in the future as this will provide answers to the extent to which capsular switching is contributing to the pneumococcal disease burden in Ghana almost a decade after introducing PCV-13. Continuous monitoring of antibiotic resistance patterns at both phenotypic and genotypic levels, along with serotyping and molecular typing, should be a standard practice in the surveillance of pneumococcal disease burden in Ghana.

Burden of leprosy and associated risk factors for disabilities in Tanzania from 2017 to 2020.

Leprosy is caused by Mycobacterium leprae which affects skin, nerves, eyes, and nasal mucosa. Despite global elimination efforts, Tanzania remains among 13 countries reporting more than 1000 leprosy cases annually. In 2021, Tanzania identified 1,511 new cases, with 10% having grade II disability. Moreover, 14 councils recorded leprosy rates exceeding 10 cases per 100,000 population. This study aimed to assess the burden of leprosy and associated risk factors for disabilities in Tanzania from 2017 to 2020. A retrospective cross-sectional study was conducted to investigate all registered treated leprosy patients from January 2017 to December 2020. The Leprosy Burden Score (LBS) was used to assess the disease burden, while binary logistic regression was employed to evaluate the risk factors for disability. A total of 6,963 leprosy cases were identified from 2017 to 2020. During this period, the point prevalence of leprosy declined from 0.32 to 0.25 per 10,000 people, and the new case detection rate decreased from 3.1 to 2.4 per 100,000 people; however, these changes were not statistically significant (p > 0.05). Independent risk factors for leprosy-related disabilities included male sex (Adjusted Odds Ratio (AOR) = 1.38, 95% Confidence Interval (CI) 1.22-1.57), age 15 years and above (AOR = 2.42, 95% CI 1.60-3.67), previous treatment history (AOR = 2.18, 95% CI 1.69-2.82), and positive Human Immunodeficiency Virus (HIV) status (AOR = 1.60, 95% CI 1.11-2.30). This study identified male sex, older age, positive HIV status, and prior treatment history as independent risk factors for leprosy-related disabilities. Additionally, despite the observed decline in point prevalence and new case detection rates, these changes were not statistically significant. To address leprosy-related disabilities, it is crucial to implement specific prevention strategies that focus on high-risk groups. This can be accomplished by enhancing screening and contact tracing efforts for early patient identification to prevent delays in intervention. Further research is warranted to analyze the burden of leprosy over a more extended period and to explore additional risk factors not covered in this study.

Prevalence and predictors of non-response to hepatitis B vaccination among dialysis patients

Abstract Background: Chronic hepatitis B virus (HBV) infection remains a global health problem and a leading cause of cirrhosis and hepatocellular carcinoma. Dialysis patients have an increased risk of contracting HBV due to shared dialysis machines, use of blood products and arteriovenous fistula or graft needling. The efficacy of HBV vaccination series is reduced in dialysis patients. The efficacy of this intervention needs to be better studied in South Africa. Methods: All patients undergoing dialysis at a large urban hospital who had received the HBV vaccine at least 6 months prior had the following variables documented: demographics; aetiology of end stage kidney disease (ESKD); mode of dialysis; history of smoking or immunosuppression; body mass index (BMI) and serology (HBV, hepatitis C virus (HCV) and human immunodeficiency virus (HIV) status). The prevalence of non-response to the HBV vaccination and predictors of non-response in these patients was determined. Results: 129 patients were included with a median age of 45 years, 52.7% were male, 14.3% were HIV positive and 2.3% were HCV infected. 21% of patients had a BMI greater than 30kg/m². 8.5% of patients received immunosuppression. The commonest cause of ESKD was ‘unknown aetiology’ (39.5%) followed by hypertension (31.0%). 55% were receiving haemodialysis and 45% peritoneal dialysis. 21.7% of the cohort had not adequately responded to the HBV vaccine. Immunosuppression was associated with poorer HBV vaccine response (p = 0.0498); no other variables predicted seroconversion. Conclusion: This study from a large urban hospital in Johannesburg, South Africa, demonstrated a seroconversion rate similar to international studies. Only the use of immunosuppression showed a lower odds ratio of a successful vaccination.

Prevalence of cervical intraepithelial lesions and associated factors among women attending a cervical cancer clinic in Western Uganda; results based on Pap smear cytology.

There are high incidence and mortality rates of cervical cancer among females in East Africa. This is exacerbated by limited up-to-date data on premalignant lesions and associated factors in this setting. In this study, we determined the prevalence of cervical intraepithelial lesions and associated factors among women attending the Mbarara Regional Referral Hospital cervical cancer clinic in Southwestern Uganda. In this cross-sectional study, 364 participants were recruited from among women attending the Mbarara Regional Referral Hospital cervical cancer clinic from 1 April to 30 June 2023. On consent, the study nurse collected demographic data and Pap smears, which were microscopically examined and reported by a laboratory scientist and a pathologist following the Bethesda grading system (2014). Statistical analyses were done in STATA version 17, using proportions, Chi-square, bivariate, and multivariate logistic regression analysis to determine associated factors at ⩽0.05 significance level. The mean age of participants was 41.9 years. A third of all study participants (37.6%, 132/351) were contraceptive users, mostly hormonal contraceptives (87.1%, 115/132). Almost 88% (307/351) had an unknown Human Papilloma Virus status. The prevalence of cervical intraepithelial lesions among our study participants was 6.6% (23/351), of which 73.9% (17/23) were low-grade squamous intraepithelial lesions. More than half (9/17, 52.9%) of low-grade squamous intraepithelial lesions were active hormonal contraceptive users. Use of hormonal contraceptives (OR: 3.032, p: 0.0253), use of intrauterine devices (OR: 6.284, p: 0.039), and any family history of cervical cancer (OR: 4.144, p: 0.049) were significantly associated with cervical intraepithelial lesions. The prevalence of cervical intraepithelial lesions was 6.6%, lower than global estimates. Use of hormonal and intrauterine device contraceptives, as well as family history of cervical cancer, were significantly associated with cervical intraepithelial lesions among our study population. Prospective studies are recommended to further understand associations between different types of intrauterine devices and hormonal contraceptives, and cervical lesions.

An update on apple chlorotic leaf spot virus status of sweet cherry in Bulgaria

The sweet cherry (Prunus avium L.) is one of the most important stone fruit species in Bulgaria. The cherry is susceptible to many viruses. To gain a better insight into the phyto-virologic status of sweet cherry, a survey for the presence of apple chlorotic leaf spot virus (ACLSV), cherry leafroll virus (CLRVR) and raspberry ringspot virus (RpRSV), in addition to ilarviruses, was carried out in 32 commercial and 6 collection orchards in ten regions of Bulgaria between 2017 and 2022. A total of 1503 sweet cherry samples were collected from symptomatic and symptomless trees. These samples were tested by cocktail ELISA for ACLSV and DAS-ELISA for CLRVR, RpRSV ?nd additionally for prune dwarf virus (PDV) and prunus necrotic ringspot virus (PNRSV) to detect mixed infections. Of the three viruses studied, only ACLSV was detected in commercial and collection sweet cherry orchards in all regions with intensive cherry cultivation in Bulgaria, in addition to ilarviruses. The extent of ACLSV virus infection was 8.8%. Single ACLSV infection was the most common, affecting 79.6% of infected sweet cherry trees, followed by ACLSV and PDV (14.4%) and least frequently by ACLSV and PNRSV (6.0%). The presence of ACLSV in orchards of different ages, including ?young? orchards, indicates that virus-free propagation material must be used when establishing new orchards to prevent the spread of pathogens with the planting material.

Vector competence of two globally distributed mosquito species originated from Japan in transmitting Japanese encephalitis virus—Analyses according to their respective insect-specific virus status

Japanese encephalitis virus (JEV) constitutes a persistent public health concern in Japan. Despite the prevalence of potential JEV vectors, Aedes albopictus Skuse and Culex pipiens form molestus Forskål, their competence within the Japanese mosquito population remains unexplored. This study aimed to assess the role of these two mosquito species, incorporating an analysis of insect-specific virus (ISV) infection status to comprehensively understand vector competence assessment. Mosquito colonies were initially screened by high-throughput sequencing to determine their natural infection of ISV and subsequently exposed to JEV genotype I and III. Evaluation points, including infection rate (IR), dissemination rate (DR), and transmission efficiency (TE) were analyzed to define vector competency, and respective ISV statuses such as Culex flavivirus (CxFV) and Aedes flavivirus were investigated post-JEV exposure. We found that both species could transmit JEV, albeit at a distinct rate of TE, i.e., ∼61% and ∼11% in Ae. albopictus and Cx. p. molestus. The presence of ISVs in the studied mosquito colonies generally showed no statistically significant impact on JEV vector competence; nonetheless, experiments employing Cx. p. molestus showed a lower DR at 7 dpi in CxFV-infected colonies compared to CxFV-free colonies. In conclusion, our findings suggest that both Japan-originated mosquito species have the capability to infect and transmit JEV genotypes 1 and 3, while the virome appears to exert no influence on this phenotype. While positive and negative interactions between ISV and arbovirus have been described in many studies, further investigations are necessary to fully comprehend the mechanism behind these interactions.

Spread of Hepatitis A and B among Inmates of Correctional Centers: A cause for concern

Correctional centers have populations with higher rates of blood borne infections, including hepatitis B Virus, due to the concentration of impoverished and vulnerable groups of people at increased risk in these settings, such as people who inject drugs and people who exchange sex for drugs or money. Many people who are incarcerated also have risk factors for hepatitis A virus infection mainly due to the environment of closed penal institutions and socioeconomic conditions. Aim The purpose of this study was to evaluate HAV and HBV virus status among inmates of a correctional center in Calabar, Cross River State Nigeria.. Method A total of one hundred inmates with the mean age of 35 years participated in the study. their serum samples were tested for HAV and HBsAg antibody using one step Anti-HAV and Anti-HBV test strips. Results The prevalence of HAV infection among the inmates was found to be 1.00% and 10.0% for HBV. Male prison inmates had seroprevalence of 1.14% for HAV while all the females that participated in the study were non-reactive for hepatitis A virus (0.00% prevalence). The result also showed highest prevalence of 14.28% among inmates aged 40 years and above while the lowest prevalence was observed among those aged below 20years with 4.54% prevalence for HBsAg and highest prevalence was recorded between 20 to 40 years of age for hepatitis A with a prevalence of 1.56%. There was a statistically significant association (p&lt;0.05) between duration of stay in prison, equipment sharing, sexual exposure, multiple partners and Hepatitis B virus infection. Alcoholism was also found to associate significantly with both Hepatitis A and Hepatitis B virus infection. Conclusion 10.0% prevalence of Hepatitis B virus infection and 1.0% Hepatitis A virus that were observed among correctional center inmates studied are high and course for concern. Attitude and behaviors by inmates such as tattooing/scarification, injection drugs use, sharing of shaving equipment, multiple sexual partners and alcohol consumption should be discouraged. There is need to promote advocacy programs especially as regards avoiding practices that enhances hepatitis A virus and hepatitis B virus infection and transmission.

Access to dental care is still complex in 2022 for patients living with HIV despite the need for careful monitoring of pathologies of the oral mucosa. Results of a monocentric cross-sectional study in the Infectious Diseases Department of Clermont-Ferrand University Hospital.

Describe the dental care pathway of people living with HIV (PLHIV) and their oral pathologies. A monocentric cross-sectional study involving adult PLHIVs followed (October 2021/April 2022) in our department. Socio-demographic and medical data, course of dental care, and presence of pathologies of the oral mucosa were recorded. 112 PLHIV (71% men, 54 ± 14years) were included. Of the 112, 96% had already consulted a dentist, and 78% had a referring dentist; 73% had disclosed their seropositivity; for 84%, the visit proceeded normally, 7% refused treatment; for 8%, the dentist was not comfortable, and for 4% the dentist's attitude became negative; 21% of the PLHIV had already encountered difficulties in finding a dentist including 37% because of their viral status. Among the oral pathologies listed, 23 lesions were identified: 15 (65%) were unrelated to HIV, 4 (17%) were classified stages B/C (1 Kaposi's sarcoma, 1 oral villous leukoplakia, 2 chronic candidiasis), and 4 (17%) were lesions with evolution specifically due to HIV (2 inhomogeneous leukoplakias, 1 cancer, 1 verrucous papilloma). Although 78% of the PLHIV included had a referring dentist, discrimination by dentists toward PLHIV still persists (16% of the PLHIV concerned). 27% of participants did not feel ready to disclose their infection. The resulting lack of follow-up is also a loss of opportunity because while most of the small number of oral lesions diagnosed in this population are related to age or comorbidities, some are serious and need to be identified.

Subclinical circulation of Chicken infectious anaemia virus- A Sero-molecular study.

Chicken infectious anaemia-an important immunosuppressive viral disease of chicken-gained much attention in the recent past. Based on huge mortality and production loss observed in the fast-growing poultry sector, the present study aimed to find out the current status of the chicken infectious anaemia virus (CIAV), among chicken flocks in the Punjab state of India by sero-molecular study. The sera from the blood samples were tested for anti-CIAV antibodies by indirect ELISA and also compared with haematological parameters. DNA from sero-positive samples underwent PCR amplification, sequencing and phylogenetic analysis of the most conserved genomic region (VP3 gene) to detect viraemia in asymptomatic birds. The serological study using indirect ELISA showed a high sero-positivity of 77.27% in chicken flocks. Additionally, the present study also revealed the high molecular evidence (72.54%) of CIAV in apparently healthy birds. Genetic analysis showed that all CIAVs have conserved VP3 genes without any nucleotide substitutions, indicating presence of CIAV and its subclinical circulation among apparently healthy flocks. The wide distribution of CIAV among birds may be the reason for huge mortality and production loss. Further, it is suggested that studies be conducted to find out the co-involvement of CIAV with other immunosuppressive microbial agents and the immunosuppressive effect of CIAV in apparently healthy birds. Also, its role in vaccine failure and outbreaks of various other avian diseases needs to be explored.

DNA damage response-related immune activation signature predicts the response to immune checkpoint inhibitors: from gastrointestinal cancer analysis to pan-cancer validation.

DNA damage response (DDR) deficiency has emerged as a prominent determinant of tumor immunogenicity. This study aimed to construct a DDR-related immune activation (DRIA) signature and evaluate the predictive accuracy of the DRIA signature for response to immune checkpoint inhibitor (ICI) therapy in gastrointestinal (GI) cancer. A DRIA signature was established based on two previously reported DNA damage immune response assays. Clinical and gene expression data from two published GI cancer cohorts were used to assess and validate the association between the DRIA score and response to ICI therapy. The predictive accuracy of the DRIA score was validated based on one ICI-treated melanoma and three pan-cancer published cohorts. The DRIA signature includes three genes (CXCL10, IDO1, and IFI44L). In the discovery cancer cohort, DRIA-high patients with gastric cancer achieved a higher response rate to ICI therapy than DRIA-low patients (81.8% vs. 8.8%; P < 0.001), and the predictive accuracy of the DRIA score [area under the receiver operating characteristic curve (AUC) = 0.845] was superior to the predictive accuracy of PD-L1 expression, tumor mutational burden, microsatellite instability, and Epstein-Barr virus status. The validation cohort demonstrated that the DRIA score identified responders with microsatellite-stable colorectal and pancreatic adenocarcinoma who received dual PD-1 and CTLA-4 blockade with radiation therapy. Furthermore, the predictive performance of the DRIA score was shown to be robust through an extended validation in melanoma, urothelial cancer, and pan-cancer. The DRIA signature has superior and robust predictive accuracy for the efficacy of ICI therapy in GI cancer and pan-cancer, indicating that the DRIA signature may serve as a powerful biomarker for guiding ICI therapy decisions.

Clinical and laboratory considerations: determining an antibody-based composite correlate of risk for reinfection with SARS-CoV-2 or severe COVID-19.

Much of the global population now has some level of adaptive immunity to SARS-CoV-2 induced by exposure to the virus (natural infection), vaccination, or a combination of both (hybrid immunity). Key questions that subsequently arise relate to the duration and the level of protection an individual might expect based on their infection and vaccination history. A multi-component composite correlate of risk (CoR) could inform individuals and stakeholders about protection and aid decision making. This perspective evaluates the various elements that need to be accommodated in the development of an antibody-based composite CoR for reinfection with SARS-CoV-2 or development of severe COVID-19, including variation in exposure dose, transmission route, viral genetic variation, patient factors, and vaccination status. We provide an overview of antibody dynamics to aid exploration of the specifics of SARS-CoV-2 antibody testing. We further discuss anti-SARS-CoV-2 immunoassays, sample matrices, testing formats, frequency of sampling and the optimal time point for such sampling. While the development of a composite CoR is challenging, we provide our recommendations for each of these key areas and highlight areas that require further work to be undertaken.

Association of bone mineral density and potential risk factors for osteoporosis in patients with severe haemophilia A.

In people with haemophilia (PWH), recurrent episodes of bleeding lead to joint deterioration and bone resorption. To date, the effects of various other factors on bone mineral density (BMD) reduction have found conflicting results. The aim of this study was to analyse the relationships between BMD, bone mineral content (BMC), and trabecular bone score (TBS) parameters based on the dual X-ray absorptiometry method (DXA) and potential risk factors for osteoporosis in patients with severe haemophilia A. Fifty-five men with severe haemophilia A, aged 18-68 years, and 59 healthy volunteer men were enrolled in this study. Densitometric-derived lumbar spine and femoral neck BMD, BMC, and TBS were measured. Blood analyses were performed for morphology parameters, liver and kidney function parameters, and viral status. Serum levels of oestradiol (E2 ), testosterone (T), dehydroepiandrosterone sulphate (DHEA-S), parathormone, and vitamin D were measured. Patients showed significantly lower BMD compared to controls (p<.003). The result below the expected range for age was nearly double (6.82%vs. 3.92%) in PWH under 50 years old compared to controls. Haemophilic patients also exhibited significantly higher vitamin D3 deficiency (p<.0001), which was strongly associated with low TBS. Additionally, low body mass index and high neutrophil/lymphocyte ratio were correlated with low BMC and BMD. This study confirms the prevalence of low BMD and BMC in patients with haemophilia in Poland. Factors that contribute to low BMD are primarily vitamin D deficiency, low BMI, high neutrophil/lymphocyte ratio, and low testosterone/oestradiol ratio.