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[The effect of Federal Public Health Service guidelines on air, surface and floor germ count in a general surgery and an orthopedic operating room].

In a prospective study the environmental contamination in an old and a new operating theatre was investigated. The old operating rooms were constructed in 1936 whereas the new rooms were built in 1986. The study was conducted in surgical and orthopedic surgical operating rooms. There was a slight increase in floor as well as in surface contamination in the new operating rooms. On the other hand there was a slight decrease in the airborne microorganisms in the orthopedic surgery and nearly identical colony counts in the general surgery operating rooms. All the differences were statistically not significant. The spectrum of microorganisms and the occurrence of Staphylococcus aureus in the old and the new operating rooms showed no difference.