Simmons R B, Price D L, Noble J A, Crow S A, Ahearn D G
Bibliographic info:
American Industrial Hygiene Association Journal, Vol 58, 1997, pp 900-904, 6 figs, 1 tab, 25 refs.

In seven hospitals in the eastern United States air filters of various types, selected by discoloration, were collected from the primary and secondary filter banks of the HVAC systems. The samples were then examined with direct microscopy for fungal colonization. Results showed that filters from five of the hospitals were colonized with fungi. Several of the species had not previously been reported to colonize air filters.