Salmonella is harmful. 1. Salmonella is a common foodborne pathogen, is a gram-negative bacillus. 1885 cholera epidemic Salmonella and others isolated Salmonella hog cholera, so it will be named Salmonella genus. 2. In addition to infecting people, Salmonella can also infect mammals, amphibians, reptiles, birds and other animals. Salmonella infection can cause typhoid fever, gastroenteritis, septicemia and extraintestinal focal infections and other diseases. 3. Salmonella infection is contagious, and its source of infection is mainly salmonella-infected poultry and livestock and humans, and the transmission route is fecal-oral transmission. If patients develop salmonella infection or related symptoms, they should go to the hospital in time for diagnosis and treatment.