The nutritional requirements of the genus Salmonella.

The nutritional requirements of the Genus Salmonella, especially of such particular members as S. typhi (1, 2), S, gallinarum and S. pullorum(2), etc, have long been investigated. Salmonella organisms were classified by Hohn et al. (3) into two categories, Ammonium strong and Ammonium weak, according to their ability to grow in the ammonium synthetic medium. In 1946 Lederberg and Tatum(4) studied with a number of strains of Salmonella to determine their nutritional requirements in an attempt to deal with genetic analysis of bacteria and demonstrated that the majority of them possess no growth factor requirements, whereas the other strains require various amino acids and vitamins. However, the growth requirements of S. typhi suis and S. abortus ovis, as well as one strain out of each of S. paratyphi A and S. paratyphi B, were left undetermined. In the present paper will be discussed the results obtained from the experiments upon the nitrogeneous requirements of 144 strains of Salmonella, with the purpose of verification of the supposition that the nutritional requirements of microorganisms may be related to their pathogenicity or parasitism.