Salmonella bacteria cause food poisioning, typhoid fever and paratyphoid fever. More than 2500 different strains of salmonella have been identified.
Anyone can get salmonella, but young children, the elderly and people whose immune systems are not working properly have a greater risk of becoming severely ill.
Symptoms include watery diarrhoea, stomach cramps and sometimes vomiting and fever. These symptoms usually last for four to seven days and clear up without treatment, but if you become seriously ill you may need to be treated for dehydration (fluid loss) caused by the illness.
Transmission occurs by eating contaminated food, mainly of animal origin, or by faecal contamination from an infected person or animal.