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Skin hypersensitivity testing and estimation of precipitating antibodies against A. fumigatus were carried out in 55 adult patients of bronchial asthma. Twenty percent of the patients showed an immediate hypersensitivity reaction and 7.2% showed a delayed type Ill reaction. Precipitin antibodies were present in 5.4% of cases. There were three possible cases (5.4%) of allergic bronchopulmonary aspergillosis among these 55 patients. Pertinent literature has been reviewed.