Salmonella Typhi Bacterium

Salmonella typhi is the cause of the systemic febrile illness typhoid fever. S. typhi, as opposed to the other species of Salmonella, has no animal reservoir. It is strictly a human pathogen and is spread by the fecal-oral route by asymptomatic carriers. Currently, there are 107 known strains of th e bacteria. S. typhi is a facultative anaerobic, gram-negative rod and is part of the Enterobacteriaceae family.

After ingestion, the organisms multiply in the small intestine, then...