[Microbiological contamination of disinfectants used in the hospitals for the disinfection of medical instruments. Part I].

Among the 10 bactericidal agents which were used in the hospitals to disinfection of medical instruments, Aldesan was the preparation exerting the strongest bactericidal effect. The highest bacterial counts were observed in the used solutions of Sterinol and preparations containing chlorhexidinum gluconicum. The bacterial contamination of ethyl alcohol 70% v/v shows that this solution should not be used to disinfection of "clean" medical instruments. The considerable proportion of samples contained Gram-positive cocci. It is reasonable, therefore, to compare the sensitivity of bacteria strains isolated from hospitals to disinfectants with that of the laboratory test strains.