[Use of the staphylococcal coagglutination reaction to serogroup Escherichiae].

A stable, highly specific antibody diagnostic agent suitable for use in the slide agglutination test was obtained by the adsorption of rabbit OK antisera to different species of the Escherichia genus by staphylococci Cowan I containing protein A in their cell walls. The high effect iveness of the staphylococcal reagent is due to adsorption from rabbit IgG antisera containing specific Escherichia antibodies. The diagnosis of Escherichia infections with the use of staphylococcal antibody diagnostic agent may prove to be considerably cheaper and simpler.