Evidence for a two-stage model of microbial infection.
D000818:Animals; D002645:Chickens; D006168:Guinea Pigs; D007239:Infections / Q000209:etiology*; D051379:Mice; D008954:Models, Biological; D012481:Salmonella Infections, Animal / Q000209:etiology*; D012485:Salmonella typhi; D012486:Salmonella typhimurium