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Protein A in Staphylococcus aureus strains of human and bovine origin.

Staphylococcus aureus strains from human infections and from bovine cases of acute and of chronic mastitis were studied regarding protein A content. Human strains as well as bovine strains from acute mastitis showed high levels of protein A production in parallel with a high incidence of cell wall associated protein A. In contrast, S. aureus strains from bovine cases of chronic mastitis showed a significantly lower production of protein A. Only about 50 per cent of these strains had detectable cell wall associated protein A. Host-parasite relationship in staphylococcal infections might favour the presence of protein A in strain from acute infections. In chronic bovine mastitis, however, the low levels of protein A detected in these strains seem to indicate that other factors play a more important role.