Abstract
In contradistinction to typhoid, the present day knowledge of paratyphoid infections of man is as yet incomplete, although important advances in this field have been made during the last few years. The identification of the various members of the Salmonella group presents difficulties far greater than those encountered in the recognition of the typhoid bacillus. The genus Salmonella is comprised of many different species and types. As a matter of fact, more than one hundred species have been described in the past as pathogens for human beings or animals or both. Special diagnostic antiserums are required to establish species or type identity. To add to the difficulty, the members of the Salmonella group are responsible for a variety of clinical syndromes. The diseases may be classified conveniently into three large groups: (1) paratyphoid, (2) gastroenteritis and (3) pyogenic infections. To the latter group belong such syndromes as septicemia, peritonitis, osteomyelitis,

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