Humidifier lung and summer-type hypersensitivity pneumonitis in Japan: a nationwide retrospective observational study of clinical, radiological and pathological features.

BMJ Open Respir Res · 2026 · PMC13239438 · PMID 42230300

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an increasing trendno p-value reported

Results Overall, 430 HFL and 784 SHP cases were identified, with an increasing trend over time and a marked rise in HFL during the COVID-19 pandemic.

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