[A case of pneumonitis due to serrapeptase].

A case of pneumonitis due to Serrapeptase was described. A 69-year-old man was treated with Serrapeptase for 16 days because of common cold, then fever, nonproductive cough and dyspnea developed and chest X-ray revealed diffuse fine granular shadows in bilateral lung fields. Once the administration of Serrapeptase was halted, symptoms, chest X-ray abnormalities and laboratory data improved markedly. The fraction of lymphocytes increased in bronchoalveolar lavage fluid and OKT4/T8 decreased. Microscopic examination of transbronchial lung biopsy showed interstitial pneumonia. Both leukocyte migration inhibition test and sensitized hemagglutination test were positive for Serrapeptase. Based on these findings, we diagnosed this case as Serrapeptase-induced pneumonitis.