Respiratory Viral Detection and Invasive Bacterial Infections in Infants ≤90 Days.

Publication date: Aug 10, 2026

Comprehensive data are needed to guide the use and interpretation of molecular respiratory viral testing in evaluating infants 0 to ≤90 days old for invasive bacterial infections (IBIs). We aimed to describe the frequency and severity of respiratory viral infections in febrile and nonfebrile infants 0 to ≤90 days of age with emergency department visits or hospitalizations for acute respiratory illness and to quantify the occurrence of IBI (bacteremia and bacterial meningitis) in these groups. The New Vaccine Surveillance Network conducts acute respiratory illness surveillance at 7 US pediatric medical institutions in the United States. We conducted a cross-sectional analysis of febrile and nonfebrile infants 0 to ≤90 days of age enrolled in the emergency department or inpatient hospital settings. Respiratory viral detection from research respiratory samples in the context of clinical severity and IBI was examined. Three thousand seven hundred and eighty febrile and nonfebrile infants 0 to ≤90 days of age enrolled from December 1, 2016, to March 31, 2020. Respiratory syncytial virus was the most common virus detected regardless of febrile status. IBIs were significantly more frequent in febrile infants without a respiratory virus compared with those with a respiratory virus detected (4. 9% vs. 1. 3%; P

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