The genus Salmonella is the main pathogenic bacteria that causes acute gastroenteritis. The more common strains are S. Typhimurium, S. Enteritidis, S. Choleraesuis, S. Gallinarum, and S. Anatipestifer. These bacteria are widely present in the intestines of various animals such as pigs, cattle, sheep, dogs, chickens, ducks, and rodents.