A prospective observational study conducted at Bangladesh Shishu Hospital and Institute re-evaluated infants (<2 years) who presented with World Health Organization (WHO)-classified pneumonia. Among 60 enrolled children meeting WHO criteria (cough, fast breathing and/or chest in-drawing), nasopharyngeal PCR identified respiratory syncytial virus (RSV) in 41 cases, representing 68% of the cohort. These findings indicate a high prevalence of viral bronchiolitis within a population initially classified as having WHO-defined pneumonia.
The study was prospective and observational in design. Participants were infants under 2 years old who attended the largest academic paediatric hospital in Bangladesh during July 2020 through June 2021. Systematic sampling was used, with every second eligible child enrolled, yielding a total sample size of 60. Patients met the initial inclusion criteria based on WHO pneumonia definitions (cough, fast breathing and/or chest in-drawing). All further analyses and reassessments were performed after initial enrollment.
To differentiate bronchiolitis from bacterial pneumonia, enrolled infants underwent a comprehensive reassessment that included clinical examination, chest radiography, haematological and biochemical testing, and microbiological analysis. Complete blood counts and C-reactive protein (CRP) measurements were used to help distinguish bacterial from non-bacterial etiologies. Chest radiographs were reviewed to identify features supportive of a viral bronchiolitis pattern versus bacterial consolidation. Nasopharyngeal aspirates (NPA) were collected for molecular testing of respiratory viruses.
NPA specimens from all 60 infants were subjected to polymerase chain reaction (PCR) assays for RSV, influenza A and influenza B. RSV was detected in 41 children (68%). The abstract does not report detection rates for influenza A or B separately, nor does it specify coinfection rates or PCR cycle thresholds. The high RSV detection rate aligned with other clinical and radiographic features indicative of bronchiolitis in the majority of cases.
RSV-positive cases commonly had clinical signs and symptoms suggestive of bronchiolitis. Chest radiography was described as benign in 85% of RSV-positive children. Haematological results for the cohort showed a mean total white blood cell count of approximately 15,488/mm3 (SD 1,874) with a mean neutrophil percentage of 36% (SD 11). Mean CRP was 4.49 mg/L (SD 5.88), under the study’s stated cut-off reference value of >5 mg/L for CRP suggestive of bacterial infection. These laboratory values were interpreted by the authors as more consistent with non-bacterial infection favoring RSV bronchiolitis.
The 19 children without RSV detection did not display marked differences in clinical presentation, haematology, microbiology or radiographic features compared with RSV-positive children, suggesting a bronchiolitis-like illness across the whole cohort. The abstract does not provide further stratified statistical comparisons beyond these summaries.
Despite clinical, radiological and molecular evidence consistent with viral bronchiolitis in most patients, antibiotics were prescribed in 95% of the 60 cases. The abstract does not detail the classes, routes, duration, or indications for the antibiotics used, nor does it report whether antibiotics were initiated prior to hospital assessment or adjusted after PCR results. No information on antiviral use, supportive measures, or adherence to local or international bronchiolitis management guidelines is provided in the abstract.
Disease outcomes, discharge patterns and length of hospital stay (LOS) were used to support the authors’ interpretation that many WHO-classified pneumonia cases represented bronchiolitis-like illness. The mean LOS for the cohort was 4.7 days (SD 2.29). The abstract reports that outcomes and discharge patterns did not differ meaningfully between RSV-positive and non-RSV cases. Specific outcome measures (for example, need for supplemental oxygen, intensive care admission, readmission, or mortality) are not reported in the abstract.
The authors conclude that a substantial proportion of infants classified with WHO-defined pneumonia in this setting actually had viral bronchiolitis, with RSV detected in 68% of cases. Despite viral etiology indicators, antibiotics were administered in 95% of patients, highlighting probable overuse of antimicrobials. The study calls for attention from policymakers to address diagnostic overlap between WHO-classified pneumonia and bronchiolitis and to implement measures aimed at reducing unnecessary antibiotic prescribing.
The abstract provides a concise summary of methodology and primary findings but does not report several potentially relevant details: specific influenza detection results, antibiotic types and durations, timing of antibiotic initiation relative to diagnostic testing, further clinical outcome measures (such as oxygen requirement or intensive care), and statistical comparisons between groups beyond descriptive values. These details were not reported in the source abstract.