Abstract
The lecture presents modern representations about etiopathogenesis and classification of the protracted subfebrile fever in children, the main features of the methodology of children examination are taken up. There are described the mechanisms of thermoregulation in early chidhood. The consecutive algorithm of diagnostic search is presented in order to determine the reasons of the protracted subfebrile fever. These reasons correlates with background microsemiology and age of the child. In the separate block there are presented the short description and methods of diagnostics of the endemic diseases. The separate block of the general anamnestic risk factors of the protracted subfebrile fever in childhood is allocated. In the separate block there are presented the short description and methods of diagnostics of the endemic diseases. Diagnostic search of the reasons of the protracted subfebrile fever in children surely should come to an end with the diagnosis, which is present in the international classification of diseases of the X revision.