The bacteria that cause salmonella food poisoning are spread by ingesting infected food ( food that is prepared in unhygienic conditions)
The salmonella bacteria secrete harmful chemicals called 'toxins' - These cause the symptoms of salmonella
salmonella symptoms:
diarrhoea
nausea/vomiting
abdominal pain
Salmonella can be treated with antibiotics, but it is not always necessary to take them as most people recover without treatment within a week.
Salmonella bacteria are sometimes found in poultry such as chickens - however in the uk all chickens are vaccinated against salmonella to control the spread of salmonella