Salmonella bacteria are zoonotic and can be transferred between humans and other animals. These are intestinal pathogens and are cause for many diseases viz. typhoid paratyphoid food poisoning etc. Classic typhoid fever is a serious and life-threatening infection which has a mortality approaching 20%. Cases of enteric fever almost always occur from the ingestion of contaminated food or water. These bacteria can survive for some time without a host for weeks outside a living body and they are not destroyed by freezing. They are frequently found in polluted water contamination from the excrement of carrier animals being particularly important.