its contribution in the air came up to 58% in 2002 and 33%
in 2003. Rhizopus spp. is a typical “indoor mould.” However,
an unusually high concentration of this mould in the
canteen came from fruits and vegetables used for preparation
of meals. In afternoons, microbiological composition
of the air in the canteen was dominated by other typical
“indoor moulds” genera like Penicillium spp., Aspergillus
spp., Mucor spp. and “outdoor mould” Cladosporium spp.
Also a second typical “outdoor mould” Alternaria spp.
appeared in the air of investigated halls in afternoons.
These spores of both genera Cladosporium and Alternaria
emerging and raising in the course of the day in the air of
lecture halls and other rooms occupied by many people
are evidence of continuous input of microorganisms from
outside via visiting people.