SUMMARY: The fungal flora of the air of hospital wards was investigated by using slit samplers. Isolations were made on Sabouraud glucose agar and particular attention was paid to the flora which grew at 37°. was recovered on each of the 78 days of sampling and reached peak of incidence in the autumn and winter months; no other fungal species was recovered at 37° with such regularity. Bed sweeps revealed the presence of these fungi on blankets in the hospital wards. The mean equivalent diameter of the air-borne particles was determined for several fungal species and was found to correspond closely to that of individual spores. No dissemination of fungal particles by four patients with the hypersensitivity type of aspergillosis or by one patient with an aspergillus mycetoma was observed.


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