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Immunofluorescent studies of bovine hypersensitivity pneumonitis.

Antigens of Micropolyspora faeni were located by immunofluorescence in apparent association with alveolar macrophages within sections of lung from cases of bovine interstitial pneumonia. Pretreatment of frozen sections with pH 2.8 glycine-HC1 buffer was a necessary prerequisite for specific staining. Bovine immunoglobulin and bovine complement were identified in similar locations.