About the Vaccines
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Currently Approved Vaccines
Pfizer-BioNTech & Moderna
Pfizer: Individuals 12 years and older
Moderna: Individuals 18 years and older
Two doses of an mRNA vaccine is required*
Viral Vector Vaccines:
AstraZeneca & Janssen (Johnson & Johnson)
- Individuals 18 years and older
- Janssen: One dose series
AstraZeneca: Requires a second dose of AstraZeneca or an mRNA vaccine*
* If you received a first dose of an mRNA vaccine, you can safely receive either of the mRNA vaccines as your second dose. If you received a first dose of AstraZeneca, you can safely receive AstraZeneca or an mRNA vaccine as your second dose. For more information, view the summary of National Advisory Committee on Immunization statement of June 17, 2021.
Two mRNA and two viral vector COVID-19 vaccines have been approved by Health Canada and are used to prevent COVID-19. View Health Canada’s authorized vaccines for COVID-19. Before any vaccines are available in Ontario or Canada, they undergo large clinical trials to determine if they are safe and effective. Health Canada has maintained the same quality standards for review and approval of COVID-19 vaccines as were in place before the pandemic.
COVID-19 vaccines are free for anyone living in Ontario. The vaccine is not mandatory for the public but is strongly recommended to keep yourself and the community safe.
How Do the Vaccines Work?
Vaccines work by teaching your immune system how to produce antibodies that prevents you from becoming sick if you are exposed to the virus in the future. The vaccine provides your body with something that looks like the virus so that your immune system can learn to identify the virus and produce specific antibodies to fight the virus, without exposing you to the virus that causes COVID-19. All four of the vaccines are administered by injection as a needle in the upper arm.
The mRNA vaccines use a method called messenger RNA (mRNA) which acts as a code that tells your cells how to make a piece of the outer lining of the virus, for a short period of time. This piece of the virus is enough for your immune system to learn how to recognize and be ready to fight off the virus, but it cannot make you sick.
The viral vector vaccines are slightly different in that they use a harmless non-replicating viral vector, which produces components of the outer lining of the virus. These will not cause COVID-19 infection, but it remains in the body long enough to build an immune response to the virus.
Public Health Ontario:
How effective are the Vaccines?
All COVID-19 vaccines approved by Health Canada are safe and effective against COVID-19. The best way to prevent COVID-19 infections, hospitalizations, and deaths in Canada is to increase population immunity. The more people who receive vaccines, the more we will be able to reduce or prevent community spread.
All four approved vaccines are effective at preventing severe, symptomatic infection with COVID-19. Immunity may take up to 14 days to develop, and individuals vaccinated will still be required to follow public health measures.
It is very important that you complete the full vaccination series to protect yourself completely against COVID-19. You will be at risk of contracting COVID-19 until you complete the full vaccination series. Most COVID-19 vaccines require two doses to complete the series (except the Janssen vaccine). The first dose of the vaccine trains your body to recognize the virus and the second dose prolongs the duration of protection. For more information, view the summary of National Advisory Committee on Immunization statement of June 17, 2021.
Information about COVID-19 Vaccines Available in Canada:
First Nations, Inuit and Métis perspectives and knowledge sharing on COVID-19 vaccines by Women’s College Hospital, Maad'ookiing Mshkiki – Sharing Medicine
Dr. Onye Nnorom talks about her thoughts on the COVID-19 vaccine by the Black Health Alliance