A study of airborne Alternaria spores was carried out over the period from April 1992 to October 1993, in the Rehabilitation Medical Centre of Montescano (PV), using an automatic volumetric spore trap (VPPS 2000 Lanzoni). The evaluation of the air concentration of these spores is becoming ever more important as it is this mycophyte which is the commonest cause of a positive allergy test. In 1993 the concentration of AIternaria spores was much higher than in the previous year and the period of highest sporulation was different, depending on the different rainfall pattern of the 2 years.
In the setting of an aerobiological study of confined environments and environmental prevention of nosocomial infections, aerobiological monitoring of 22 areas in Montescano Medical Rehabilitation Centre (Pavia) was performed in three different months: February, May, and August, 1994. A Lanzoni 3000 spore trap was used for the monitoring. Examination of the results showed that, in the environments monitored, the indoor presence of fungi increased progressively over the three periods considered. The behaviour of individual genera of fungi differed. In the winter period Penicilliun7 and A~pergillus were the most commonly encountered genera. Cladosporium was the dominant genus from the spring to the summer while the yeasts had their maximum counts in the spring morning. The use of air conditioning, combined with the low air exchange between outdoors and indoors in some of the environments certainly played a part in the low concentrations of these latter aerofungi.
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