It’s ‘unknown’ when Canada will reach herd immunity from coronavirus vaccine, Tam says

The percentage of the Canadian population that needs to be vaccinated in order to reach widespread immunity against the coronavirus is unknown, according to Canada’s chief public health officer Dr. Theresa Tam.

Speaking as a media conference Friday, Tam was asked what entails a “successful vaccine campaign,” in order to determine when the population reaches herd immunity.

“Nobody actually knows the level of vaccine coverage to achieve community immunity or herd immunity,” Tam explained. “We have an assumption that we will probably need 60 to 70 per cent of people to be vaccinated. But we don’t know that forsure … that’s modelling. Lots of these calculations are being done but bottom line is that we actually don’t know.”

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