Evolution of views on legionellosis is analyzed in the review: from extremely dangerous rare infection to sufficiently widespread severe pneumonia emergence of which is determined by features of ecology and prevalence of natural water microorganism in potentially dangerous water systems created by man. Epidemiologic features of 3 main groups of legionellosis determined according to place of acquisition are discussed: sporadic (community-acquired) legionellosis; nosocomial legionellosis; legionellosis related with trip or travel. Modern principles of organization of epidemiologic surveillance for legionellosis based on the disease's incidence monitoring, observation on circulation of the agent in potentially dangerous water systems, conducting of prophylactic measures aimed at prevention of sporadic cases and epidemic outbreaks. Organization of epidemiological surveillance for Legionella infection in Russian Federation in present time is developed on the basis of international standards, recommendations of World Health Organization, home practical experience from elimination of epidemic outbreaks of legionellosis, and results of Legionella isolation from potentially dangerous water objects on territory of Russia.
Retrospective analysis of epidemic cholera manifestations was made in Daghestan using the data of operative epidemic analysis of the break in 1994. Unexpected prolongation of epidemic process of cholera for Daghestan, which was imported by pilgrims from Southern-Western Asia, has been shown using climate-geographical social-demographical and sanitary-hygienic peculiarities. Common laws of development of epidemic complications were demonstrated, as well as the main ways of infection transmission of great number of Daghestan settlements in epidemic process. The importance of antiepidemic means and significant role of created specialized antiepidemic groups have been emphasized in rapid carrying out of means in infection focus, including massive investigation of people in settlements.
The epidemic of cholera in the Derbent District of the Daghestan was imported into the region. 172 cholera patients and 204 Vibrio carriers were registered in 23 settlements of the region during the period of June 26 to October 12, 1994. The wide spread of this infection was facilitated by high migration activity of the population and the belated introduction of measures for limiting migration. The most severe outbreaks of cholera were observed in Derbent and in the villages of Mamedkala and Morskoe.