Biotyping and determination of protein A in Staphylococcus aureus strain of skin origin.

By means of biotyping we have investigated 150 strains of Staphylococcus aureus isolated from people with dermatologic complaints. We have used six main and three additional biotyping tests. The strains under investigation did not form a closed biotype, on the contrary, they showed a certain biotype plurality. The determination of protein A in 150 strains of S. aureus isolated from dermatologic process of men, 15 strains of S. aureus of bovine origin and 50 strains of Staphylococcus with negative coagulase activity have brought the following results: all strains of S. aureus of skin origin (human strains) contain protein A in various quantities keeping within 2-64 U. Only 2 from 15 s. aureus strains of bovine origin contain protein A and there were none in 50 strains of Staphylococcus with a negative coagulase reaction.