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Parainfluenza virus bronchiolitis. Epidemiology and pathogenesis
Insights
Parainfluenza virus (PV) causes bronchiolitis, particularly in non-Caucasian males. Breastfeeding reduces risk, while smoke exposure and bottle feeding increase recurrent wheezing in infants with PV bronchiolitis.
Area of Science:
- Pediatrics
- Virology
- Immunology
Background:
- Bronchiolitis is a common respiratory infection in infants.
- Parainfluenza virus (PV) is a significant causative agent of bronchiolitis.
- Understanding PV bronchiolitis epidemiology and pathogenesis is crucial for prevention and treatment.
Purpose of the Study:
- To investigate the epidemiology and pathogenesis of bronchiolitis caused by parainfluenza virus (PV).
- To identify risk factors and immune responses associated with PV bronchiolitis and recurrent wheezing.
Main Methods:
- Epidemiological analysis of patient demographics and feeding methods.
- Assessment of immune responses, including cell-mediated immunity and IgE titers.
- Comparison of patients with bronchiolitis versus upper respiratory tract infection.
Main Results:
- PV bronchiolitis was more common in non-Caucasian males.
- Breastfeeding was associated with a reduced risk of bronchiolitis.
- Cigarette smoke exposure and bottle feeding increased recurrent wheezing after PV bronchiolitis.
- Subsequent viral infections uniformly resulted in wheezing.
- Higher cell-mediated immune responses and PV-specific IgE titers were observed in bronchiolitis patients.
Conclusions:
- PV bronchiolitis shares epidemiological and pathogenic similarities with respiratory syncytial virus (RSV) bronchiolitis.
- Lower respiratory tract infections may predispose infants to bronchoconstriction.
- Environmental factors like smoke exposure and feeding methods influence disease outcomes and recurrence.
Abstract:
An investigation of the epidemiology and pathogenesis of bronchiolitis due to parainfluenza virus (PV) was carried out. Bronchiolitis due to PV occurred most commonly in non-Caucasian males. Breast-fed infants exhibited a reduced risk of developing bronchiolitis. Once an episode of PV bronchiolitis occurred, both exposure to cigarette smoke and bottle feeding were associated with an increased frequency of recurrent wheezing, and subsequent infection with respiratory virus almost uniformly resulted in wheezing. Cell-mediated immune responses to PV antigen and titers of PV-specific IgE were greater among patients with bronchiolitis than among patients with upper respiratory tract infection. The epidemiology and pathogenesis of bronchiolitis due to PV is similar to that of respiratory syncytial virus. Lower respiratory tract infection may predispose to episodes of bronchoconstriction on subsequent exposure to cigarette smoke or other viral infections.