You've probably heard this term being used, but might still wonder "what is vaccine efficacy?" Dr. Supriya Sharma, chief medical advisor at Health Canada, has explained it.

It is used to describe how effective a vaccine is against things like infection, and serious outcomes like hospitalizations and deaths.

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In the midst of a pandemic, the race to develop effective COVID-19 vaccines is ongoing.

The first two approved by Health Canada were introduced last year, but the country has continued to look for other candidates

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