it is a unique work dealing with fungal contamination in intensive care units and operation rooms. An interesting subject rarely touched by microbiologist. Most of the previous researches dealt with bacterial contamination. In this piece of work you will find interesting records on mycology, mycotoxins, enzymes that might be enhancing the severeness of opportunistic fungi to invade nosocomial and immunosupressive patients. It also embraced a new technique of using chlorella vulgaris as a sensitive andreliable biological assay.