Salmonella is transmitted by fecal contamination of food and water.
Like e. coli food borne infections, the usual causal sequence is related to use of fresh sewage (rather than well-composted, benign sewage) for fertilizer, or by fecal contamination by food handlers.
Typhoid is caused a salmonella organism: Typhoid Mary. Most folks get over salmonella infections without treatment and without diagnostic stool culture, which complicates the work of the epidemiologists who are trying to find the source. Very old, very young, and immune-compromised folks are at highest risk of serious illness. Most docs treat salmonellosis with cipro or levaquin.
Wildman-to paraphrase Judge Learned Hand, military medicine is to medicine as military music is to music-
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Dance like you have never been hurt, work like no one is watching,love like you don't need the money.