https://www.canada.ca/en/public-health/services/diseases/coronavirus-disease-covid-19/vaccines/effectiveness-benefits-vaccination.html
Effectiveness of vaccination
Vaccination is one of the most effective ways to protect our families, communities and ourselves against COVID-19. Evidence indicates that the vaccines used in Canada are very effective at preventing severe illness, hospitalization and death from COVID-19.
A booster dose following a primary series of mRNA vaccines offers better protection against Omicron infection and severe disease than the primary series alone.
Among people who are vaccinated against COVID-19, studies show that:
their level of protection against infection from the primary series decreases over time and is low against Omicron, but can be improved with a booster dose
the primary series appears to maintain good protection against severe disease and hospitalization caused by Omicron
protection against severe disease and hospitalization is higher after a booster dose
Vaccination is very important, even if you've been previously infected with COVID-19. While infection alone provides some protection, vaccination after infection helps improve the immune response and may provide better and longer-lasting protection.
Risk factors for exposure to and severe outcomes from the virus should be assessed when considering the timing of COVID-19 vaccination. Consult your local public health authority for more information on when you should get vaccinated after having COVID-19.
We continue to closely monitor the evolving science and research related to vaccine effectiveness.
Effectiveness of vaccination
Vaccination is one of the most effective ways to protect our families, communities and ourselves against COVID-19. Evidence indicates that the vaccines used in Canada are very effective at preventing severe illness, hospitalization and death from COVID-19.
A booster dose following a primary series of mRNA vaccines offers better protection against Omicron infection and severe disease than the primary series alone.
Among people who are vaccinated against COVID-19, studies show that:
their level of protection against infection from the primary series decreases over time and is low against Omicron, but can be improved with a booster dose
the primary series appears to maintain good protection against severe disease and hospitalization caused by Omicron
protection against severe disease and hospitalization is higher after a booster dose
Vaccination is very important, even if you've been previously infected with COVID-19. While infection alone provides some protection, vaccination after infection helps improve the immune response and may provide better and longer-lasting protection.
Risk factors for exposure to and severe outcomes from the virus should be assessed when considering the timing of COVID-19 vaccination. Consult your local public health authority for more information on when you should get vaccinated after having COVID-19.
We continue to closely monitor the evolving science and research related to vaccine effectiveness.
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