Community-acquired Pneumonia Group Research Articles

Invasive pulmonary aspergillosis among patients with severe community-acquired pneumonia and influenza in ICUs: a retrospective cohort study

RationaleThe prevalence, clinical characteristics, and outcomes of invasive pulmonary aspergillosis in patients with severe community-acquired pneumonia (CAP) in intensive care units remain underestimated because of the lack of a disease-recognition scheme and the inadequacy of diagnostic tests.ObjectivesTo identify the prevalence, risk factors, and outcomes of severe CAP complicated with invasive pulmonary aspergillosis (IPA) in intensive care units (ICUs).MethodsWe conducted a retrospective cohort study including recruited 311 ICU-hospitalized patients with severe CAP without influenza or with influenza. Bronchoalveolar lavage fluid (BALF) samples were from all patients and subjected to mycological testing. Patients were categorized as having proven or probable Aspergillus infection using a modified form of the AspICU algorithm comprising clinical, radiological, and mycological criteria.Measurements and main resultsOf the 252 patients with severe CAP and 59 influenza patients evaluated, 24 met the diagnostic criteria for proven or probable Aspergillus infection in the CAP group and 9 patients in the influenza group, giving estimated prevalence values of 9.5% and 15.3%, respectively. COPD and the use of inhaled corticosteroids were independent risk factors for IPA. IPA in patients with severe CAP was significantly associated with the duration of mechanical support, the length of ICU stay, and the 28-day mortality.ConclusionsAn aggressive diagnostic approach for IPA patients with severe CAP and not only influenza or COVID-19 should be pursued. Further randomized controlled trials need to evaluate the timing, safety, and efficacy of antifungal therapy in reducing IPA incidence and improving clinical outcomes.

Comparison of outcomes and characteristics of patients admitted to the ICU with COVID-19 and other community-acquired pneumonia based on propensity score matching

ObjectiveTo compare the similarities and differences between patients with Coronavirus Disease 2019 (COVID-19) and those with other community-acquired pneumonia (CAP) admitted to the intensive care unit (ICU), utilizing propensity score matching (PSM), regarding hospitalization expenses, treatment options, and prognostic outcomes, aiming to inform the diagnosis and treatment of COVID-19.MethodsPatients admitted to the ICU of the Third People’s Hospital of Datong City, diagnosed with COVID-19 from December 2022 to February 2023, constituted the observation group, while those with other CAP admitted from January to November 2022 formed the control group. Basic information, clinical data at admission, and time from symptom onset to admission were matched using PSM.ResultsA total of 70 patients were included in the COVID-19 group and 119 in the CAP group. The patients were matched by the propensity matching method, and 37 patients were included in each of the last two groups. After matching, COVID-19 had a higher failure rate than CAP, but the difference was not statistically significant (73% vs. 51%, p = 0.055). The utilization rate of antiviral drugs (40% vs. 11%, p = 0.003), γ-globulin (19% vs. 0%, p = 0.011) and prone position ventilation (PPV) (27% vs. 0%, p < 0.001) in patients with COVID-19 were higher than those in the CAP, and the differences were statistically significant. The total hospitalization cost of COVID-19 patients was lower than that of CAP patients, and the difference was statistically significant (27889.5 vs. 50175.9, p = 0.007). The hospital stay for COVID-19 patients was shorter than for CAP patients, but the difference was not statistically significant (10.9 vs. 16.6, p = 0.071).ConclusionOur findings suggest that limited medical resources influenced patient outcomes during the COVID-19 pandemic. Addressing substantial demands for ICU capacity and medications during this period could have potentially reduced the mortality rate among COVID-19 patients.

Correlation between fat-soluble vitamin levels and inflammatory factors in paediatric community-acquired pneumonia: A prospective study.

Community-acquired pneumonia (CAP) is a common respiratory disease in children. This prospective cohort study of 110 children with CAP and 100 healthy children investigated the relationship between the levels of vitamin A, D and E and inflammatory markers, such as tumour necrosis factor (TNF-a), interleukin-1 (IL-1), interleukin-10 (IL-10), neutrophils (NE) and C-reactive protein (CRP), in CAP. The haemoglobin, leukocyte concentration, NE, monocytes and CRP concentration in the CAP group showed significant differences (P < 0.05). The levels of vitamin A, D and E in the CAP group were lower than those in the control group, while the levels of TNF-a and IL-1 were higher than in the control group; the differences were statistically significant (P < 0.05). The IL-10 levels showed no significant differences (P > 0.05). Pearson analysis revealed that the vitamin A, D and E levels were all correlated with the TNF-a, IL-10 and CRP levels (P < 0.05). The vitamin A, D and E levels of the CAP children were lower than those of the healthy children. Thus, the content of fat-soluble vitamins is correlated with the secretion of TNF-a and IL-10. The research provides a new direction for the prevention, diagnosis and treatment of CAP.

Neutrophil to lymphocyte ratio in pediatric patients with asthmatic exacerbation and community-acquired pneumonia

BackgroundCompared with a lower neutrophil to lymphocyte ratio(NLR), a higher one denotes severe asthma exacerbation in hospitalized asthmatic children. In addition, NLR is significantly higher in pediatric patients with community-acquired pneumonia (CAP) than those without. Nevertheless, its role in pediatric patients with concomitant asthmatic exacerbation and CAP remains unknown.MethodsIn this retrospective study including 1032 pediatric patients aged 5 to 14 years old, the diagnostic and prognostic value of NLR in children with concomitant asthmatic exacerbation and non-severe CAP were investigated.ResultsThe sensitivity and specificity of NLR for a diagnosis of CAP in patients with asthmatic exacerbation were 56.9% and 90.1%, respectively. The cutoff value of NLR for a diagnosis of CAP in patients with asthmatic exacerbation was 4.15 (P < 0.001). The cumulative asthmatic exacerbation during 3-month followup of patients with high NLR were 23 (21.3%) and 58 (42.0%) in the asthma and asthmatic CAP groups, respectively (P < 0.001). The patients with high NLR who had unimproved CAP were 15 (8.3%) and 23 (12.2%) in the CAP and asthmatic CAP groups, respectively (P = 0.006). Multivariate analyses showed that along with the increase of NLR by 1.0 point, the HR for the occurrence of asthmatic exacerbation and unimproved CAP were 2.91 [1.83–3.96] (P = 0.001) and 3.38 [1.66–5.10] (P < 0.001), respectively.ConclusionsNLR had high and moderate diagnostic value for the exclusion and indication of CAP, respectively, in pediatric patients with asthmatic exacerbation. It also had prognostic value for the outcomes of pediatric patients with concomitant asthmatic exacerbation and CAP.

The levels of vitamins and cytokines in serum of elderly patients with community-acquired pneumonia: A case-control study.

The community acquired pneumonia (CAP) is a common disease with high incidence rate and mortality among the elderly. This study aims to explore the association between vitamins, cytokines, and CAP infected by different pathogens in Handan First Hospital. The subjects of this study were elderly patients with community-acquired pneumonia in Handan First Hospital and healthy elderly people in the community from February 2018 to December 2019. The study include 234 CAP patients and 180 healthy elderly people. The differences between the healthy and CAP groups were analyzed by blood routine test, urine routine test, Liquid chromatography tandem mass spectrometry (LC-MS/MS) detection of vitamin level, and Enzyme linked immunosorbent assay (ELISA) detection of cytokine level. Sputum culture was used to detect pathogens. According to our results, there was no significant difference in the contents of vitamin A, vitamin D, vitamin E, and vitamin C in serum between the healthy and CAP elderly. However, compared with the control group, the levels of serum cytokines of IL-2, IL-17, and TGF-β in the CAP patients were significantly increased. In addition, IL-17 was positively correlated with white blood cells, neutrophils, platelet/lymphocyte ratio and neutrophil/lymphocyte ratio of CAP patients, and negatively correlated with lymphocytes. The four pathogens with the highest positive rates were Streptococcus pneumoniae, Klebsiella pneumoniae, Mycoplasma pneumoniae and H. influenza. In patients with S. pneumoniae infection, the IL-2, IL-17, and TGF-β levels were significantly higher than the levels in the control group; IL-17 was also significantly increased in the serum of patients infected with M. pneumoniae, K. pneumoniae, and H. influenza. There is no direct association between vitamins in serum and community acquired pneumonia (CAP). However, the cytokines are closely related to the clinical indicators and pathogens of CAP patients, which can provide references for the diagnosis, prognosis and treatment of CAP patients.

Diagnostic value of plasma heparin-binding protein and the heparin-binding protein-to-albumin ratio in patients with community-acquired Pneumonia: a retrospective study

BackgroundPatients presenting to the emergency department with community-acquired pneumonia (CAP) are characterized by advanced age, comorbidities, critical illness and less-than-typical symptoms, posing a diagnostic challenge. Plasma heparin-binding protein (HBP) and the heparin-binding protein-to-albumin ratio (HBP/Alb) have not been adequately studied in the early diagnosis of CAP. This study assessed the diagnostic value of plasma HBP, HBP/Alb, and conventional inflammatory markers in emergency department patients with CAP.MethodsWe enrolled 103 patients with CAP, retrospectively analyzed the patients’ clinical data, and divided the CAP patients into antibiotic (n = 79) and non-antibiotic (n = 24) groups based on whether antibiotics were administered prior to blood sampling and laboratory tests. The control group was comprised of 52 non-infected patients admitted during the same period. Within 24 h of admission, plasma HBP, serum procalcitonin (PCT), white blood cell count (WBC), neutrophil-to-lymphocyte ratio (NLR) and HBP/Alb levels were collected separately and compared. The receiver operating characteristic (ROC) curve was plotted to assess the diagnostic value of each indicator for CAP patients. Utilizing the Kappa test, the consistency of each indicator used to evaluate CAP and clinical diagnosis was analyzed. Spearman correlation was used to analyze the correlation between plasma HBP and clinical indicators of CAP patients.ResultsPlasma HBP, serum PCT, WBC, NLR and HBP/Alb were all elevated in the CAP group in comparison to the control group (P < 0.001). Plasma HBP, serum PCT, WBC, NLR and HBP/Alb levels did not differ statistically between antibiotic and non-antibiotic groups (P > 0.05). Plasma HBP and HBP/Alb had the highest diagnostic accuracy for CAP, the area under the ROC curve (AUC) were 0.931 and 0.938 (P < 0.0001), and the best cut-off values were 35.40 ng/mL and 0.87, respectively. In evaluating the consistency between CAP and clinical diagnosis, the Kappa values for HBP, PCT, WBC, NLR and HBP/Alb were 0.749, 0.465, 0.439, 0.566 and 0.773, respectively. Spearman correlation analysis showed that plasma HBP was positively correlated with serum PCT, WBC, NLR and HBP/Alb in CAP patients (P < 0.001).ConclusionsPlasma HBP and HBP/Alb have a high clinical diagnostic value for CAP and can be used as good and reliable novel inflammatory markers in the emergency department for the early diagnosis of CAP patients.

Can we recognize severe community-acquired pneumonia without pneumonia severity index? Use of modified qSOFA with procalcitonin

ObjectiveThe aim of this study is to analyze the diagnostic value of Quick Sequential Organ Failure Assessment (qSOFA), modified qSOFA, National Early Warning Score (NEWS) and NEWS + Lactate (NEWS + L) scores in the detection of severe community-acquired pneumonia (CAP). MethodsThis research is a retrospective cohort study. Patients admitted to the Emergency Department (ED) with the diagnosis of CAP were divided into severe and mild pneumonia regarding their Pneumonia Severity Index (PSI) scores. The accuracies of lactate, procalcitonin (PCT) values, NEWS and qSOFA scores, as well as score combinations (NEWS + L and qSOFA + PCT) in predicting patients with severe CAP were analyzed. ResultsMedian qSOFA value in the severe CAP group (0 [IQR 0–1]) was found to be higher than median qSOFA value (0 [IQR 0-0]) in the mild CAP group (p < 0.001). The rate of qSOFA positivity (qSOFA ≥ 2) was significantly higher in the severe CAP group (17.1%, n = 21) compared to the mild CAP group (1.3%, n = 1) (p < 0.001). Median qSOFA + PCT for the severe CAP group (2 [IQR 1–2]) was higher than the mild CAP group (1 [IQR 0–1]) (p < 0.001). Mean NEWS score for severe CAP (4.95 ± 3.09) was found to be 1.69 (95% CI 0.92–2.46) higher than mean NEWS score of the mild CAP group (3.26 ± 2.39) (p < 0.001). The severe CAP NEWS + L score (6.97 ± 3.71) was higher than the mild CAP NEWS + L score (4.94 ± 2.48) (p < 0.001). Blood lactate level was not significant in the evaluation of severe CAP (p = 0.221). PCT (AUROC = 0.685 [95% CI 0.610–0.760]; p = 0.038), NEWS score (AUROC = 0.658 95% CI [0.582–0.733]; p < 0.001), qSOFA (AUROC = 0.686) were calculated to have adequate accuracy for the detection of severe CAP. [95% CI 0.613–0.759]; p = 0.037), NEWS + L score (AUROC = 0.665 [95% CI 0.589–0.740]; p = 0.038). The qSOFA + PCT score (AUROC = 0.758 [95% 0.691–0.825]; p = 0.034) was also found to be a highly accurate predictor of severe CAP. ConclusionIn this study, we found a combination of qSOFA and PCT to be the most reliable method of detecting severe CAP.

CD4+ T cells related to disease severity in elderly and frailty community-acquired pneumonia patients: A retrospective cohort study.

Elderly and frailty individuals show a more senescent immune system, which may relate to worse outcome in community-acquired pneumonia (CAP). This study aimed to explore prognostic factors related to immune. Sixty of elderly (≥65 years) and frailty (clinical frailty scale ≥5 scores) nonsevere CAP patients and 60 severe CAP (SCAP) patients were recruited at our center. Clinical and laboratory data, and several assessment scores were collected. Compared with nonsevere CAP group, the elderly and frailty SCAP patients showed higher level of BMI, PaCO2 and lactate in arterial blood-gas, CURB-65 score, ICU admission, mechanical ventilation, shock accidence, and longer hospital stay using two-tailed t test. The SCAP group also showed increased CRP, IL-6, and PCT, and decreased CD3+ T cells, CD4+ T cells, and CD8+ T cells. Logistic regression analysis showed that CD4+ T cells, IL-6 and PCT were independent prognostic factors for SCAP. The area under the receiver operating characteristic (ROC) curve for CD4+ T cells combined with PCT was 0.771 (95% CI 0.683-0.859), and the sensitivity and specificity were both 76.7%. Paired t test analysis showed that low CD4+ T cells in SCAP patients increased after treatment. CD4+ T cells decreased in elderly and frailty SCAP patients, and CD4+ T cells combined with PCT were relatively accurate in the prediction of elderly and frailty SCAP.

Microplastics in the Bronchoalveolar Lavage Fluid of Chinese Children: Associations with Age, City Development, and Disease Features.

This study characterized the occurrence patterns of microplastics (MPs) in the bronchoalveolar lavage fluid (BALF) of children with pulmonary diseases. MPs were detected in 89.6% of BALF samples with an average of 4.31 ± 2.77 items/10 mL, supporting the hypothesis that inhalation is a significant pathway of airborne MP exposure to pediatric lungs. Inhaled MPs were predominantly composed of 10 polymer types [e.g., polypropylene (41.9%), polyethylene (19.4%), and polyester (13.6%)], with the majority being smaller than 20 μm. MP levels in BALF exhibited a negative correlation with children's age, probably owing to the preferential crawling and tumbling actions in indoor environments and underdeveloped immune systems of young children. Participants living in urban areas suffered from higher pulmonary MP exposure, likely due to higher environmental levels, compared with suburban/rural residents (P < 0.05). Although no significant differences were found between MP levels in pediatric lungs with community-acquired pneumonia (CAP) and asthma (P > 0.05), the severe CAP group displayed significantly higher MP contamination than the nonsevere group (P < 0.05), indicating that some yet undiscovered relationship(s) between inhaled MPs and pediatric pulmonary diseases may exist.

Heparin-binding protein combined with human serum albumin in early assessment of community-acquired pneumonia: A retrospective study

Objective: To investigate the application of heparin-binding protein along with albumin (HBP+ALB) in evaluating the severity of community-acquired pneumonia (CAP) and compares it with single HBP, white blood cells (WBCs), C-reactive protein (CRP), and procalcitonin (PCT). Methods: A total of 226 patients with CAP admitted to the Emergency Department of Zhujiang Hospital, Southern Medical University, Guangdong, China, between March 1, 2021, and March 1, 2022, were enrolled. The patients were grouped into two groups: mild CAP (n=175) and severe CAP (sCAP)(n=51). Patients' characteristics and laboratory data were obtained. ROC curve and the value of the area under the curve (AUC) were used to evaluate the predictive values of HBP, ALB, WBC, CRP, and PCT. Results: WBC count, CRP, PCT, HBP, creatinine, and D-dimer were higher in the sCAP group, while ALB was lower in the sCAP group (P&lt;0.05) than those in the mild CAP group. The AUCs of WBC, CRP, PCT, HBP, and HBP+ALB were 0.633 (95% CI: 0.545-0.722, P&lt;0.05), 0.635 (95% CI: 0.542-0.729, P&lt;0.05), 0.705 (95% CI: 0.619-0.791, P&lt;0.05), 0.809 (95% CI: 0.736-0.883, P&lt;0.05), and 0.889 (95% CI: 0.842-0.936, P&lt;0.05), respectively. Conclusions: HBP+ALB has a higher predictive value than single HBP, PCT, CRP and WBC used alone for the early assessment of CAP.

Increased antimicrobial resistance in bacterial pneumonia among Egyptian Children during the COVID-19 pandemic

BackgroundPneumonia is the major cause of morbidity and mortality among children worldwide. During the COVID-19 pandemic, the use of antibiotics increased which led to the development of antibiotic-resistant strains of pathogenic organisms causing pneumonia in children. So, studies should be directed to register antimicrobial resistance in each country and to develop local antimicrobial stewardship. This study aimed to identify the distribution of bacteria causing pneumonia among Egyptian children in the year 2020 and their antimicrobial sensitivity. A cross-sectional study was done, it included fifty immunocompetent children with pneumonia admitted to Children's Hospital, Ain-Shams University from June 2020 to December 2020. Bacterial cultures were done on sputum collected using cough swab, or endotracheal tube aspirate, with their antimicrobial sensitivity.ResultsThirty children had Community-acquired pneumonia (CAP), while twenty had Hospital-acquired pneumonia (HAP). Streptococcus pneumonia was the most frequently cultured organism in CAP group 7/30 (23.3%). The sensitivity results found linezolid (50%), followed by fluoroquinolones to be the least resistant. While in the HAP group, Klebsiella pneumonia 9/20 (45%) was the most common organism. Colistin (90%) followed by tigecycline (50%), Amikacin (35%), fluoroquinolones (25%), gentamicin (25%), and imipenem (20%) had the least resistance in the HAP group.ConclusionNo pathognomonic shift of the bacteria that causes pediatric pneumonia was detected. Although, an increase in antimicrobial resistance was noticed.

Could we use digital infrared medical thermography to distinguish SARS-СоV-2 viral from community acquired pneumonia?

Objectives: This study set out to determine the possibility to differ SARS-СоV-2 viral pneumonia from community acquired pneumonia (CAP) by mean of digital infrared medical thermography. Material, methods: Totally 380 patients were evaluated: with diagnosis 'U07.1COVID-19, virus identified. SARS-CoV-2 pneumonia' (group 1) — 208 pts, with community acquired viral or bacterial pneumonia (group 2) — 172 pts. Thermographic assessment was performed using TBC300-med infrared camera (manufactured by LLC 'STC SILAR', Saint Petersburg, Russia, image format 384 x 288, thermal resolution 30 mK). To store and analyze thermographic images cloud application 'TVision' (LLC 'Dignosys', Russia) was used. Quadrangle in shape regions of interest (ROI) were automatically created on the front and back of the thorax roughly in the projection of the upper lobe (ULP) and the lower lobe (LLP) of the lungs. Mean temperature was measured and thermal gradients- ΔТ° (side-to-side temperature difference) - were calculated between symmetric ROI both on front and back of the thorax. Values obtained were taken as modulus, the greatest value used for analysis. Results: Mean ΔТ° value were significantly higher in SARS-CoV-2 pneumonia compared with CAP group (0,56 ± 0,35 ºC and 0,32 ± 0,14ºC respectively; P &lt; 0,05). The ΔТ° value &gt; 0,51 °C is associated with SARS-CoV-2 pneumonia with sensitivity 71 % and specificity 62,8 %, area under the ROC curve 0.739; P &lt; 0,05). Conclusions. Infrared thermography proved to be a sensitive method for detection of temperature differences between both types of pneumonia and may contribute to preliminary diagnosis.

Epidemiology and risk factors of pediatric pneumonia in a tertiary center in Taiwan

Background: Pneumonia is a common disease in children, and causes a substantial burden both on patients and health care systems. Comparison between community-acquired pneumonia (CAP) and hospital-acquired pneumonia (HAP) and the prognosticator of hospitalized pneumonia patients in Taiwan is unclear. Materials and Methods: In this retrospective study, data from hospitalized children aged <18 years with a diagnosis of pneumonia from 2012 to 2013 in our institutional database were investigated. Demographic characteristics, laboratory data, identified pathogens, and treatment course was recorded for analysis. A value of P < 0.05 was considered statistically significant. Results: A total of 548 patients with 598 episodes of pneumonia (male/female ratio = 1.08) were enrolled in the database. Underlying diseases are more common in patients with HAP than those with CAP. Patients with HAP had a higher mortality and length of hospital and intensive care unit (ICU) stay than that of those with CAP. C-reactive protein (CRP) and band form plus segment neutrophil percentage were higher in patients with CAP. In multivariate analysis of CAP group, underlying disease, CRP, and band form plus segment neutrophil percentage were independent prognosticators of admission to ICU. Underlying disease and CRP were independent prognosticators of mortality. The most common pathogens were respiratory syncytial virus, Streptococcus pneumoniae, and influenza virus. Conclusions: Patients with HAP had significantly higher mortality rates and longer lengths of hospital and ICU stay than those with CAP. CRP was an independent prognosticator of admission to ICU and mortality in patients with CAP, and also served as a prognosticator of mortality in patients with HAP.

2173. Co-Occurring Dysphagia and Frailty are Common and Associated with Increased Disease Severity in Older Adults Presenting with Community-Acquired Pneumonia

Abstract Background Impaired swallowing (dysphagia) and physical (frailty) function are associated with community-acquired pneumonia (CAP), however, neither are routinely screened for in patients with CAP. We sought to: 1) examine frailty and dysphagia screening profiles in a cohort of older adults with CAP; and 2) determine if these screening profiles differ across CAP severity levels. Methods Older adults (≥65) meeting diagnostic criteria for pneumonia are included as participants. During the index encounter, dysphagia (3-ounce water swallow) and frailty (FSQ;4 ≥3 = frailty) screeners are administered. Thirty days post-enrollment, a standardized clinical severity scale is used to document CAP severity (mild (ambulatory management); moderate-severe (hospitalization)). Statistical analysis included descriptives and cross tabulations. Results We enrolled 26 participants (13 female) with a mean age of 73 (SD: 7.1). Nine (34.6%) and 17 (65.4%) patients had mild and moderate-severe CAP severity, respectively. Twenty (76.9%) and 14 (53.8%) patients met screening criteria for dysphagia and frailty, respectively. Screening profiles included: no frailty or dysphagia (15.4%), frailty and no dysphagia (11.5%), no frailty but dysphagia (30.8%), frailty and dysphagia (42.3%). No frailty but dysphagia (44.4%) was the most common mild CAP severity profile. When CAP severity worsened (moderate-severe), co-occurring frailty and dysphagia was most prevalent (47.1%). Fig. 1.Combined dysphagia and frailty screening profiles for this cohort.Dysphagia only was highly prevalent (31%), however, the majority of individuals presented with co-occurring dysphagia and frailty (42%).Fig. 2.Screening profiles across CAP severity levels.No frailty/dysphagia (44.4%) was the most common mild CAP profile. Co-occurring frailty/dysphagia was most prevalent (47.1%) in mod-severe CAP. Conclusion In this cohort, standardized screenings for dysphagia and frailty revealed both were common and frequently co-occurred, particularly in the high acuity CAP group. These data suggest older adults with pneumonia may have underlying dysphagia and/or frailty that warrant further evaluation. These potential impairments should be considered in care pathways (e.g. antibiotic therapy and rehabilitation services consultation) to mitigate negative sequelae. Disclosures All Authors: No reported disclosures.

Comparative analysis of the lung microbiota in patients with respiratory infections, tuberculosis, and lung cancer: A preliminary study.

Recent evidence suggests that lung microbiota can be recognized as one of the ecological determinants of various respiratory diseases. However, alterations in the lung microbiota and associated lung immunity in these respiratory diseases remain unclear. To compare the lung microbiota and lung immune profiles in common respiratory diseases, a total of 78 patients were enrolled in the present study, including 21 patients with primary pulmonary tuberculosis (PTB), eight patients with newly diagnosed lung cancer (LC), and 49 patients with community-acquired pneumonia (CAP). Bronchoalveolar lavage fluid (BALF) was collected for microbiota and cytokine analyses. With MiSeq sequencing system, increased bacterial alpha-diversity and richness were observed in patients with LC than in those with PTB and CAP. Linear discriminant analysis effect size revealed that CAP-associated pulmonary microbiota were significantly different between the PTB and LC groups. More key functionally different genera were found in the PTB and LC groups than in the CAP group. The interaction network revealed stronger positive and negative correlations among these genera in the LC group than in the other two groups. However, increased BALF cytokine profiles were observed in the PTB group than in the other two groups, while BALF cytokines were correlated with key functional bacteria. This comparative study provides evidence for the associations among altered lung microbiota, BALF inflammation, and different respiratory disorders, which provides insight into the possible roles and mechanisms of pulmonary microbiota in the progression of respiratory disorders.

The diagnostic value of complete blood parameters in determining the severity of community-acquired pneumonia in children

Aim: In children, community-acquired pneumonia (CAP) has a high mortality and morbidity rate. Platelet, neutrophil, lymphocyte, monocyte, eosinophil, red cell distributions width (RDW), mean platelet volume (MPV), platelet distributions width (PDW), platelet to lymphocyte ratio (PLR), and neutrophil to lymphocyte ratio (NLR) have all been suggested as markers of systemic infection and inflammation. Several research, however, have centered on the clinical significance of blood parameters in pediatric CAP. We aim to determine the diagnostic value of complete blood parameters for CAP and to look into their relationship to disease severity.&#x0D; Material and Method: A retrospective, the cross-sectional study enrolled children aged 3 months to 18 years who were diagnosed with CAP at Ankara Atatürk Sanatorium Training and Research Hospital's pediatrics clinics between January 2018 and June 2021, as well as age-matched healthy children. CAP case definition was made according to the CAP case definition defined by the World Health Organization (WHO). Patients were evaluated according to the criteria of WHO and British Thoracic Society 2011 guidelines as severe and mild CAP.&#x0D; Results: 400 CAP and 400 control patients were included in the study. The mean age of the CAP group was 2.40±3.20 years and the control group was 2.38±3.17 years. Eosinophil, hemoglobin, MPV, PDW and PLR values of the CAP group was statistically significantly lower; leukocytes, lymphocyte, monocyte, neutrophil, basophil, platelet, RDW, and NLR levels of the CAP group were higher than the control group (p

Characteristics of lower respiratory tract microbiota in the patients with post-hematopoietic stem cell transplantation pneumonia.

BackgroundPneumonia is a leading cause of non-relapse mortality after hematopoietic stem cell transplantation (HSCT), and the lower respiratory tract (LRT) microbiome has been proven to be associated with various respiratory diseases. However, little is known about the characteristics of the LRT microbiome in patients with post-HSCT compared to healthy controls (HC) and community-acquired pneumonia (CAP).MethodsBronchoalveolar lavage samples from 55 patients with post-HSCT pneumonia, 44 patients with CAP, and 30 healthy volunteers were used to detect microbiota using 16S rRNA gene sequencing.ResultsThe diversity of the LRT microbiome significantly decreased in patients with post-HSCT pneumonia, and the overall community was different from the CAP and HC groups. At the phylum level, post-HSCT pneumonia samples had a high abundance of Actinobacteria and a relatively low abundance of Bacteroidetes. The same is true for non-survivors compared with survivors in patients with post-HSCT pneumonia. At the genus level, the abundances of Pseudomonas, Acinetobacter, Burkholderia, and Mycobacterium were prominent in the pneumonia group after HSCT. On the other hand, gut-associated bacteria, Enterococcus were more abundant in the non-survivors. Some pathways concerning amino acid and lipid metabolism were predicted to be altered in patients with post-HSCT pneumonia.ConclusionsOur results reveal that the LRT microbiome in patients with post-HSCT pneumonia differs from CAP patients and healthy controls, which could be associated with the outcome. The LRT microbiota could be a target for intervention during post-HSCT pneumonia.

Adaptive immunity in different CT patterns of active tuberculosis and possible variability according to patients' geographic provenience.

BackgroundIt is still unclear if low lymphocyte levels are directly related to immunological modifications induced by the TB infection or if they depend on the general pre-existing health impairment of affected patients. Our aim was to detect eventual differences in the immunological status of patients with pulmonary TB compared to an age and sex-matched group of hospitalized patients with other bacterial community-acquired pneumonia (CAP). In addition, we tried to assess an association between alterations in the peripheral lymphocyte subsets and the development of different CT patterns of active TB and to discover differences in the immunological status and in the radiological patterns of TB presentation between patients of different geographic proveniences.MethodsThis observational study included 48 patients with TB and 48 sex- and age-matched patients affected by other bacterial CAP. The presence of HIV/AIDS, other immunocompromising conditions, and confounding chronic pulmonary comorbidities was excluded. Flow cytometry was performed on all the enrolled subjects at admission, before starting the appropriate antibiotic therapy. Patients with TB also underwent a computed tomography (CT) scan.ResultsPatients with TB showed a decrease in the absolute count of all the lymphocyte subsets compared to the CAP group. Only the reduction in the percentage of CD4+ T-lymphocytes was significant, while the percentage of CD8+ T-lymphocytes was significantly increased. Patients presenting exudative forms with atypical locations of TB showed a significant reduction in the absolute count and percentage of CD19+ B-lymphocytes compared to those affected by productive TB forms with the typical location. Despite being younger, our black Sub-Saharan Africans showed a significant reduction in the CD4+ T-lymphocytes compartment and a higher prevalence of atypical and exudative forms of TB compared with white Europeans.ConclusionTuberculosis itself may alter peripheral blood lymphocyte subsets compared to other CAP. An impaired CD19+ B-lymphocyte compartment may result in an abnormal exudative response in atypical locations and a suboptimal bacterial control. Other constitutive or environmental causes may influence immunological differences found in patients with TB, particularly in case of different geographic origins. Anyhow, flow cytometry may be of great value in evaluating the immune function of these patients.

Diagnostic Value of Mediastinal Lymphadenopathy in Differentiating Pulmonary Tuberculosis from Community-Acquired Pneumonia in Children

Background: Diagnosis of childhood pulmonary tuberculosis (TB) is often based on clinical features in combination with radiologic findings because of paucibacillary nature of the disease in children. It may be difficult to make a clinical diagnosis because of the overlapping clinical features of pulmonary TB and community-acquired pneumonia (CAP). On computed tomography (CT) scanning, the presence of typical LAP can suggest TB as a possible cause. Objectives: To compare the features of mediastinal LAPs between two patient groups based on contrast-enhanced chest CT. Methods: A total of 45 pulmonary patients with TB and 38 patients with CAP (aged ≤ 18 years) were enrolled in this retrospective study. The presence and CT features of lymph node involvement and the incidence of associating parenchymal/pleural findings were analyzed in two groups. Results: All patients with TB and 36 of the 38 patients with CAP had at least one mediastinal LAP. There was no significant difference between the two groups according to the incidence of lymph node and multiple site involvement and also involved lymph node stations (P &gt; 0.05). However, lymph node size was larger in the TB group (P = 0.04). Twenty-two percent of patients with TB had mediastinal LAP without parenchymal/pleural involvement. Conclusions: Although the lymph node size was larger in TB group than in CAP group, CT features of mediastinal lymph node involvement overlapped between two groups. Nevertheless, mediastinal LAP without parenchymal/pleural involvement on CT is seen in a significant number of TB patients.

Clinical evaluation of metagenomic next-generation sequencing for detecting pathogens in bronchoalveolar lavage fluid collected from children with community-acquired pneumonia.

This study is to evaluate the usefulness of pathogen detection using metagenomic next-generation sequencing (mNGS) on bronchoalveolar lavage fluid (BALF) specimens from children with community-acquired pneumonia (CAP). We retrospectively collected BALF specimens from 121 children with CAP at Tianjin Children's Hospital from February 2021 to December 2021. The diagnostic performances of mNGS and conventional tests (CT) (culture and targeted polymerase chain reaction tests) were compared, using composite diagnosis as the reference standard. The results of mNGS and CT were compared based on pathogenic and non-pathogenic organisms. Pathogen profiles and co-infections between the mild CAP and severe CAP groups were also analyzed. The overall positive coincidence rate was 86.78% (105/121) for mNGS and 66.94% (81/121) for CT. The proportion of patients diagnosed using mNGS plus CT increased to 99.18%. Among the patients, 17.36% were confirmed only by mNGS; Streptococcus pneumoniae accounted for 52.38% and 23.8% of the patients were co-infected. Moreover, Bordetella pertussis and Human bocavirus (HBoV) were detected only using mNGS. Mycoplasma pneumoniae, which was identified in 89 (73.55%) of 121 children with CAP, was the most frequent pathogen detected using mNGS. The infection rate of M. pneumoniae in the severe CAP group was significantly higher than that in the mild CAP group (P = 0.007). The symptoms of single bacterial infections (except for mycoplasma) were milder than those of mycoplasma infections. mNGS identified more bacterial infections when compared to the CT methods and was able to identify co-infections which were initially missed on CT. Additionally, it was able to identify pathogens that were beyond the scope of the CT methods. The mNGS method is a powerful supplement to clinical diagnostic tools in respiratory infections, as it can increase the precision of diagnosis and guide the use of antibiotics.