Fever (increased temperature)
There are other causes of fever, food poisoning is one of them, and it takes up to 7 hours to 24 hours after ingestion of contaminated food before fever-producing substances named pyrogens triggers the rise in temperature. This is sometimes released by the bacteria, virus or immune system in the body. Fever, which sometimes follows headaches is a paramount sign that the immune system is fighting back, as temperature increases, the activity of the white blood cells increases which help to fight the infection. One common virus responsible for this is the norovirus. [6]
