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заражение из неизвестного источника (The term community transmission means that the source of infection for the spread of an illness is unknown or a link in terms of contacts between patients and other people is missing. It refers to the difficulty in grasping the epidemiological link in the community beyond confirmed cases.  wikipedia.org doc090) | |||
| контактное заражение (of a virus: As of Saturday, 65 per cent of 2,811 reported COVID-19 cases in Canada were linked to community transmission, while 35 per cent were "either exposed while travelling or exposed to a traveller returning to Canada. globalnews.ca ART Vancouver) | |||