How effective are the COVID-19 vaccines?


Are COVID-19 vaccines effective against variants like Omicron?

Current vaccines provide good protection against severe illness and hospitalizations for Omicron. Some people may still get COVID-19 after they have been vaccinated (this is called “breakthrough infection”). The good news is that people that are fully vaccinated and experience a breakthrough infection are much less likely to get really sick or end up in the hospital and intensive care unit than those who are un-vaccinated and get COVID-19. 
Research that took place in BC compared the effectiveness in people who had received two doses of vaccine to those who had received a booster dose
Two doses provided good protection against severe outcomes with Omicron. Two doses prevented about 65-75% of hospitalizations (reducing the risk of COVID-19 hospitalization by about two-thirds to three-quarters compared to unvaccinated people). Two doses were less effective against Omicron infection (less than 10-15% against any infection).
Booster doses increased protection against Omicron up to more than 90% against hospitalization with Omicron and about 50-60% against Omicron infection. When you receive your invitation to book your booster, it is important to do so.


Read more about BC vaccine effectiveness on the BCCDC website.

Monitoring and research on the new COVID-19 variants continues. For more information, check out this page on the BCCDC website.

Date last reviewed: 
Sunday, Mar 27, 2022