[Typhus infection (Brill's disease) in the environment of a large city].

The data on the epidemiological analysis of 675 cases of infection of the typhus nature, detected in Leningrad in 1974-1986, are presented. The seasonal morbidity curve, the age structure of patients, the character of the clinical course of the disease and other data gave a reason for the diagnosis of Brill's disease. The comparison of the relative data on morbidity rates in typhus at different periods of the current century was made.