[Protein A research in 1200 strains of Staphylococcus (using a rapid detection technic by passive hemagglutination...

The technique used was that of passive hemaglutination of red cells of sheep prepared with glutaraldehyde and sensitized by anti-erythrocyte antibodies. A protein-A was not found in S. epidermidis strains, but was present in 96.3 per cent of 689 strains of S. aureus from human, animal and food origins.