Outer membrane proteins (OMP) isolated from Shigella flexneri, Escherichia coli, Proteus vulgaris and Salmonella typhimurium were tested for their protective activity. Each OMP preparate given to mice intraperitoneally in a single injection (5 micrograms/per mouse) protected the animals not only in homologous but also in varying intensity in heterologous systems. Evidence was obtained that this nonspecific protection is cell mediated.
All Keywords