Abstract Extract Salmonella anatum was first isolated in the United States by Rettger and Scoville (1920) from ducklings with an epidemic intestinal infection characterized by the birds “keeling” over before death. The condition is still known as “keel-disease”. S.anatum has since been isolated in the United States from the mesenteric lymph nodes of healthy pigs (Rubin et al., 1942) and from horses, cattle, sheep, goats, pigs, dogs, foxes, cats, rats, and a Gila monster (Bruner and Moran, 1949). In Mexico, its occurrence in man, pigs, cows, rats, and chicks was reported by Varela and Olarte (1952), while in Sweden it was isolated from poultry and mink by Thal et al. (1957). In Britain, it was first identified in 1941 in cultures from imported spray-dried egg associated with food poisoning in man (Wilson and Miles, 1945), and subsequently isolated from dogs, cats, and pigeons (Cruickshank and Smith, 1949) and chicks and turkeys (Smith and Buxton, 1951). In Australia, Stewart (1940) reported its occurrence ...