- A food poisoning bacterium whose toxins are not destroyed by cooking. It is found in meat pies and meat products containing salt and in confectionery. The incubation period is 2 to 6 hours and the duration of the illness 6 to 24 hours. The symptoms are nausea, vomiting, diarrhoea, and abdominal pain without fever. There may be collapse and dehydration in severe cases.