A short description of the biochemical criteria used in the differentiation of the salmonellae of subgenera I, I1 and Arizona is given. Important antigenic differences have been found between the subgenera I and 11. The pathogenicity and epidemiology of subgenus 1 1 are discussed. In 1960 Kauffmann proposed dividing the salmonellae on the basis of certain fementative differences into two biochemically defined subgenera. This subdivision is useful and is already carried out in a number of laboratories.
Bacteriological investigations were performed with 31 samples of feces from reptiles, mainly from snakes of a snake exhibition in St. Gall. 27 Salmonella and Arizona serotypes were recovered from 20 specimens (64.5%). Seven of the Salmonella isolates belonged to the sub-genus I, two to the sub-genus II, while 14 could be classified as belonging to the sub-genus III (Arizona). Single infections have occurred in 13, and double infections in 7 of the cases under study. One Salmonella serotype of the sub-genus II – Salmonella II 13,23,36:1, Z281,5 – and three Arizona serotypes – Arizona 7a,7b:23:31, Arizona 23:29:21 and Arizona 24:26:30 – could be declared as new types.
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