How does salmonella typhimurium attack and spread?

Fecal oral transmiss: Salmonella is spread between fecal material and oral ingestion in people and animals. The infection infects the intestinal tract causing inflammation with abdominal pain and diarrhea. The immune system can also be compromised.

Fecal-oral spread: Salmonella in general spreads be the fecal-oral route, usually in underdeveloped areas. People with it who live in areas without adequate sanitation or plumbing may end up stooling in areas near public or private water supplies. Or even in developed areas, they may not wash their hands well. The bacteria get into water or onto food and get ingested by the next person, who becomes the next victim.