Bronchoalveolar lavage (BAL) samples were taken in 47 patients whose symptoms were attributable to mould exposure and had visited the Clinic for Indoor Air Health Problems at the Helsinki University Central Hospital for a diagnosis of possible interstitial pulmonary disease. Tests showed that the total number of lymphocytes was elevated in 19 of these patients (40%). The percentage of lymphocytes in the cells from the lavage fluid ranged from 2 to 63% with a median of 19%. One patient had slight neutropenia.
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