An unusual example of manipulation by the host was discovered by American biologists from Salmonella enterica bacteria. Usually the organismus fights with infection and it leads to an increase in temperature and a decrease in appetite. However, this does not always benefit the body and leads to recovery. In experiments on mice, it turned out that some bacteria secrete a specific protein that reduces the production of IL-1β cytokine in the small intestine and increases the appetite of animals. Biologists suggest that such a mechanism facilitates the course of the disease, reduces the death rate of victims and helps bacteria infect other individuals.