AbstractSalmonellosis is an important worldwide problem involving all species of wild and domestic animals and fowl. With few exceptions serotypes are not host specific and cross infections are frequent. Carriers exist in most species including man. Probably no species is free of the disease. Animal feeds frequently contain the organisms. Transmission is most often due to ingestion of fecal‐contaminated food or water, but infection by contact is a frequent and serious problem. Control by sanitation and protection against contamination of feeds would appear to solve much of the problem. Improved serologic methods for detecting carriers are badly needed.