CBC cbc.ca 04 Jun, 2021 15:15 am

2nd vaccine dose key against delta variant, health officials say

2nd vaccine dose key against delta variant, health officials say
The more transmissible delta variant of coronavirus, first identified in India, is taking hold in Ontario and officials are racing to get more people fully vaccinated. Research has shown, one dose of vaccine is only about 33 per cent effective against the delta variant.
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