Particular features have been studied of the clinical course of present-day abdominal typhoid caused by Sp. typhi 61-0 polyresistant strains. The clinical analysis performed has shown that Sp. typhi 61-0 polyresistant strain-associated enteric fever runs a moderately severe and severe course. There is an increased frequency of complications such as intestinal hemorrhage, perforated intestine, pneumonia, in the above patients. In the time-related course of the disease, Widal's reaction is not considered to be expedient for use in the diagnosis of Sp. typhi 61-0 strain-associated abdominal fever.
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