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Bronchiolitis obliterans, bronchiectasis, and other sequelae of adenovirus type 21 infection in young children
Insights
Adenovirus type 21 infections in children can lead to serious lung damage, including bronchiectasis and bronchiolar obliteration. This study highlights adenoviruses as a significant cause of childhood post-infectious lung disease.
Area of Science:
- Pediatric Pulmonology
- Virology
- Pathology
Background:
- Severe lower respiratory tract infections in children can have long-term pulmonary consequences.
- Adenovirus type 21 has been implicated in respiratory illness outbreaks.
- Post-infectious lung damage, such as bronchiectasis, affects children's respiratory health.
Purpose of the Study:
- To investigate the histopathological findings in children following adenovirus type 21-induced lower respiratory tract infections.
- To determine the relationship between acute adenovirus infection and the development of chronic lung disease.
- To explore the role of bronchiolar obliteration in the pathogenesis of post-infectious bronchiectasis.
Main Methods:
- Histopathological examination of lung tissue from four children.
- Analysis of lung samples obtained 2 months to 3 years post-infection.
- Correlation of clinical data with pathological findings.
Main Results:
- All four cases exhibited widespread bronchiolar obliteration (bronchiolitis obliterans).
- Bronchiectasis and bronchial inflammation severity increased with time since acute infection.
- Necrotizing bronchiolitis during acute adenovirus infection appears to lead to bronchiolar obliteration.
Conclusions:
- Adenovirus type 21 is a likely cause of severe, acute lower respiratory tract infections in children.
- Bronchiolar obliteration is a significant sequela of these infections.
- Adenoviruses may be a major contributor to post-infectious bronchiectasis and chronic lung disease in childhood.
Abstract:
A remarkably high incidence of bronchiectasis and other pulmonary sequelae was observed in young children affected during an epidemic of severe lower respiratory tract infections apparently caused by adenovirus type 21. The histopathological findings are described in four cases in which one or both lungs were obtained for examination at intervals ranging from two months to three years after the acute infections. Widespread bronchiolar obliteration (bronchiolitis obliterans) was a striking finding in all four. The severity of bronchial inflammation and of bronchiectasis was proportional to the time elapsed since the acute infections. Bronchiolar obliteration is a likely sequel of the necrotizing bronchiolitis which may occur during acute adenovirus infections. The role of bronchiolar obliteration in the pathogenesis of bronchiectasis and other chronic lung disease is discussed. Adenoviruses may be a major cause of post-infectious bronchiectasis in childhood.