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The role of parainfluenza viruses in inspiratory difficulties in children
M Korppi1, P Halonen, M Kleemola
1Department of Paediatrics, University Central Hospital, Kuopio, Finland.
Abstract:
Viral findings were prospectively studied in middle and lower respiratory tract infections in 449 hospitalized children during a 12-month follow-up period. A viral aetiology was found in 30 of the 65 children (46%) with inspiratory difficulties. Parainfluenza viruses were the infective agents in 24 of the 30 cases with viral diagnoses (80%), type 2 being the most prominent. There were 38 cases of parainfluenza infections, type 2 being the infective agent in 58% of the 24 cases of parainfluenza infections with inspiratory difficulties but in only 21% of the 14 cases of parainfluenza infections without inspiratory difficulties. Type 2 parainfluenza virus produced inspiratory difficulties in 82% of the cases as opposed to 56 and 50% of the cases for type 1 and 3, respectively. It is concluded that the type 2 parainfluenza virus has a particular association with inspiratory difficulties in children. Viral diagnosis was reached using direct antigen detection in nasopharyngeal specimens by radioimmunoassay in 59% and using complement fixation serology in 76% of parainfluenza infections. Direct antigen detection was especially useful in infants. We suggest that direct antigen detection should be used as a primary virological diagnostic method in small children with middle and lower respiratory tract infections.
Insights
Type 2 parainfluenza virus is strongly linked to inspiratory difficulties in hospitalized children with respiratory infections. Direct antigen detection is recommended for early viral diagnosis in infants and young children.
Area of Science:
- Pediatrics
- Virology
- Respiratory Medicine
Background:
- Respiratory tract infections (RTIs) are common in children.
- Identifying viral etiologies is crucial for effective management.
- Inspiratory difficulties can indicate severe respiratory compromise.
Purpose of the Study:
- To investigate the association between specific parainfluenza virus types and inspiratory difficulties in hospitalized children.
- To evaluate the efficacy of different virological diagnostic methods.
Main Methods:
- Prospective study of 449 hospitalized children over 12 months.
- Viral etiology investigated in middle and lower RTIs.
- Direct antigen detection and complement fixation serology used for viral diagnosis.
Main Results:
- A viral etiology was identified in 46% of children with inspiratory difficulties.
- Parainfluenza viruses were the most common cause (80% of viral diagnoses).
- Type 2 parainfluenza virus showed a significant association with inspiratory difficulties (82% of cases).
Conclusions:
- Type 2 parainfluenza virus is particularly associated with inspiratory difficulties in pediatric RTIs.
- Direct antigen detection is a valuable primary diagnostic method, especially for infants.
- Early and accurate viral diagnosis can guide treatment strategies.