A.N. Sysin Research Institute of Human Ecology and Environmental Health of the Ministry of Health of the Russian Federation, Moscow 119991 GSP-1, Russia
Abstract：High prevalence of Klebsiella species in water of water bodies in different climatic zones of Russia intended for multipurpose use is established: in surface sources of centralized water supply depending on a degree of their biological and chemical contamination; in groundwater from unprotected aquifers; in drinking water that was insufficiently purified and disinfected. It is shown that Klebsiella spp. circulating in water preserve their properties as pathogens as well as virulence; they are resistant to modern drugs and disinfectants (chlorine, ultraviolet irradiation) and able to readily penetrate into aquifers..These strains of Klebsiella are known to have the significant pathogenic capacity (adhesive, invasive, phosphatase, lecitinase, DNAase, hemolytic activity) as well as genetic markers of pathogenicity cnf-1. The etiological role of Klebsiella species and their infective dose (100 CFU/dm3) causing acute enteric infections (AEI) are defined. Isolation of Klebsiella from water bodies and, especially from potable water in absence of total coliform bacteria (TCB) testifies for an insufficient role of the latter and presents an epidemic hazard in water use.
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