Protective activity of Streptococcus faecalis against pathogenic action of Escherichia coli O55 in gnotobiotic pigs.

Peroral administration of Streptococcus faecalis suppresses the lethal effect of simultaneous or subsequent infection with pathogenic Escherichia coli O55 in gnotobiotic colostrum-free piglets. The presence of S. faecalis in the intestine and mesenteric lymph nodes in artificially diassociated colostrum-free piglets influences neither multiplication of E. coli in the intestine nor its penetration into the organism.