[Cryptosporidium oocysts and epidemic safety of drinking water in the Russian Federation].

The paper provides evidence that Cryptosporidium oocysts should be necessarily included as an index of the epidemic safety of drinking water in our country. This is evidenced by: the wide spread of cryptosporidiosis among animals and human beings; that of the pathogen of this disease in the environment; large-scale outbreaks of cryptosporidiosis in the world's population; no sanitary and parasitological drinking water monitoring in our country; the use of this parasitological index to evaluate drinking water quality in some countries (USA, UK, Ukraine, etc.).