Symptoms of salmonellosis include diarrhea, fever, and abdominal cramps. They develop 12 to 72 hours after infection, and the illness usually lasts 4 to 7 days. Most people recover without treatment. But diarrhea and dehydration may be so severe that it is necessary to go to the hospital. Older adults, infants, and those who have impaired immune systems are at highest risk.
In France, during the period 2006–2008, Salmonella was the cause of 23% of dispersed food-borne outbreaks. Monophasic Salmonella Typhimurium, an emerging variant of serotype Typhimurium, is responsible for an increasing number of food-borne outbreaks in Europe.