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Updated: Aug 14, 2026

Rapid Molecular Detection and Differentiation of Influenza Viruses A and B
Published on: January 30, 2017
Influenza A and B virus infections in children
Ville Peltola1, Thedi Ziegler, Olli Ruuskanen
1Department of Pediatrics, Turku University Hospital, Turku, Finland. ville.peltola@stjude.org
Insights
Pediatric influenza hospitalizations primarily affect previously healthy infants and young children. Laboratory confirmation is crucial as symptoms in children are less distinct than in adults.
Area of Science:
- Pediatrics
- Infectious Diseases
- Epidemiology
Background:
- Influenza is a significant respiratory illness in children, often requiring hospitalization.
- Understanding the clinical profile of severe pediatric influenza is essential for effective management.
Purpose of the Study:
- To analyze clinical manifestations, age distribution, and comorbidities in hospitalized children with influenza.
- To highlight the importance of laboratory confirmation for pediatric influenza diagnosis.
Main Methods:
- Retrospective study of children treated at Turku University Hospital from 1980-1999.
- Analysis of nasopharyngeal aspirates for Influenza A or B antigen detection.
- Review of clinical data, including symptoms and underlying conditions.
Main Results:
- Influenza A median age was 2.0 years; Influenza B median age was 4.2 years.
- 24% developed acute otitis media; 9% developed pneumonia.
- Most hospitalized children were previously healthy infants and young children.
Conclusions:
- Pediatric influenza hospitalizations predominantly involve previously healthy young children.
- Clinical presentation of influenza in children is less characteristic than in adults, underscoring the need for laboratory confirmation.
- Influenza poses a significant risk for severe outcomes like otitis media and pneumonia in pediatric populations.
Abstract:
To obtain data on the clinical manifestations of infection, the age distribution, and the underlying conditions of children with influenza severe enough to lead to hospital referral, we performed a retrospective study of children treated at Turku University Hospital (Turku, Finland) in 1980-1999. Influenza A or B antigen was detected in the nasopharyngeal aspirates of 683 of the 15,420 children studied. The median age of children with influenza A was 2.0 years (n=544), and that of children with influenza B was 4.2 years (n=139) (P<.001). One-fourth of the children had an underlying medical condition. High fever, cough, and rhinorrhea were the most frequently recorded symptoms. Acute otitis media developed in 24% of the children, and pneumonia developed in 9% of the children. The study shows that the majority of patient hospitalizations for pediatric influenza involve previously healthy infants and young children. Laboratory confirmation of influenza is particularly important for children because the clinical presentation of the infection is less characteristic than that seen in adults.
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