This is a clinical manual concerned mainly with the clinical aspects, pathogenesis, and treatment of the diseases of hot climates. All doctors practicing medicine in the tropics and sub-tropics, and even these days in temperate climates, need to be familiar with the peculiarities of the pathology of diseases of hot climates. The ever-mounting movement of people between various countries and the migration of populations are leading to sporadic cases of so-called tropical diseases in areas with average or even severe climates. Local doctors therefore need to know how to diagnose them and to treat them. All the most important and common diseases of the tropical and sub-tropical zones are described in this handbook. The handbook is intended for the broad circle of general practitioners. It is reprinted from the second Soviet edition.