
The study investigated the extent to which respiratory virus infection induces airway eosinophilic inflammation by analyzing the results of bronchoalveolar lavage (BAL) and respiratory virus testing in acute respiratory disease cases. A total of 95 cases were reviewed, and 17 were positive for respiratory viruses. The study found that cases of viral infection of the lower respiratory tract showed an elevated BAL eosinophil fraction. The increase in eosinophil fraction due to respiratory virus infection was generally mild, but some cases showed marked elevation and were diagnosed with eosinophilic pneumonia. Respiratory virus infection should be considered as a potential cause of elevated BAL eosinophil fraction.
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