[Tick-borne relapsing fever morbidity in the western Pamirs].

Morbidity with tick-borne recurrent fever in the western Pamirs is compared with that of the 1930s. It reduced considerably though the disease is widespread in the Pandj valley. The majority of patients are earlier resistant local inhabitants. This may be accounted for by vector number decrease to the level causing loss of immunity in the large part of the population. Unlike even distribution of recurrent fever in the western Pamirs in the 1930s, nowadays most cases are detected in the lower parts of the Pandj valley and there are no infection foci in the upper parts, which might be connected with gradual increase in the portion of immune population up the Pandj river and with diagnosis inadequacy. The incidence of recurrent fever in the Pamirs is considerably higher than in other parts of Tajikistan.