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More About Intracellular Infection By Salmonella There are many strains of Salmonella; nearly all are potentially pathogenic. The most severe illness caused by a Salmonella strain is typhoid fever, which is caused by S. typhi. Less severe forms of gastrointestinal illnesses, such as diarrhea, are caused by many other Salmonella strains and are collectively known as salmonellosis. In this animation, you can see how one of those strains, S. typhimurium invades an epithelial cell of the intestinal tract, surv
