Objective: To describe selected microorganisms co-detected in children with influenza A treated at the Pediatric Center, Thai Nguyen National Hospital.
Subjects and Methods: A cross-sectional descriptive study included 170 hospitalized children aged 1 month to 15 years with confirmed influenza A at the Pediatric Center, Thai Nguyen National Hospital, from January 2025 to June 2026.
Results: Children aged 24–59 months accounted for 34.1%, males for 64.7%, and 92.4% of admissions occurred from October through March. At least one additional microorganism was detected in 44.7%; bacterial and viral detections were 41.2% and 6.5%, respectively. S. pneumoniae was detected most often among bacterial-positive children (57.1%), and RSV among viral-positive children (72.7%). In unadjusted exploratory comparisons, bacterial detection proportions differed by age group, admission period, and recorded pneumococcal or Hib vaccination status (p<0.05). Vaccination records did not include dose number or age-appropriate completion.
Conclusion: Additional microorganisms were detected in hospitalized children with influenza A, predominantly bacteria. Findings from unadjusted exploratory comparisons should not be interpreted as independent risk factors or vaccine effectiveness.