Disease Severity and Viral Codetection in Acute Lower Respiratory Tract Infection

Area of Science:

• Pediatric Infectious Diseases
• Respiratory Virology
• Clinical Epidemiology

Background:

• The impact of multiple viral detections (coinfections) on respiratory infection severity in children is not well understood.
• Investigating coinfections is crucial for understanding disease progression and outcomes in pediatric respiratory illnesses.

Purpose of the Study:

• To determine the association between viral coinfections and disease severity in children under five hospitalized with suspected viral pneumonia.
• To identify risk factors for severe outcomes in pediatric viral pneumonia.

Main Methods:

• A case-control study was conducted with children hospitalized between September 2019 and June 2022.
• Cases met severity criteria (complicated pneumonia, ICU admission, ventilation, death), while controls did not.
• Multiplex polymerase chain reaction (PCR) was used for viral detection, and multivariate logistic regression analyzed associations.

Main Results:

• Of 561 patients, 39.8% had viral coinfections. Overall, coinfection was not significantly associated with increased severity (adjusted OR = 1.4).
• Younger age (<1 year) and prior bronchiolitis were independently associated with greater severity.
• In infants under one year, viral coinfection was significantly associated with increased severity (adjusted OR = 2.7).

Conclusions:

• Viral coinfections are not a significant predictor of severity in all children hospitalized with suspected viral pneumonia.
• However, coinfection is a critical factor associated with more severe disease specifically in infants under one year of age.