Результаты (
английский) 3:
[копия]Скопировано!
parasites are distributed on the water, air, settle on items and food, and, of the organism in the environment, they are through the feces in the form of the so-called цист (inside the protective shell, оберегающий from adverse conditions). the main transmission environment is the water. cyst at a low temperature and chlorination of them saves, except that the boiling or special filtration system.
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