coronavirus variants gaining a foothold in Canada, the percentage of vaccinated Canadians required to achieve herd immunity is increasing, Health Canada’s chief medical adviser said on Monday.
Coronavirus vaccine tracker: How many Canadians are vaccinated against COVID-19? That’s because the B.1.1.7 variant, which first emerged in the U.K., and the B.1.351 variant, first discovered in South Africa, are believed to be more infectious than the original strain.As the virus gets better at spreading, our vaccination rates will have to be even higher to make sure those who can’t get a jab can still be kept safe, Dr.