selected strains of salmonella of varied virulence , and hybrid escherichia coli/salmonella typhimurium with varied o-antigens , revealed that those of low virulence could multiply within the intestinal peyer 's patches at nearly the same rate as a virulent strain , and the ability to multiply within the peyer 's patches was not dependent upon o-antigen type or smooth lipopolysaccharide .
C0069180
o-antigen
C0023810
lipopolysaccharide