Most current vaccines available in Canada require 2 doses in order to acquire its full protection.
- Pfizer-BioNTech COVID vaccine – return in 21 days for your second dose.
- Moderna COVID vaccine – return in 28 days for your second dose.
- AstraZeneca - return 28 days for your second dose
- Johnson & Johnson vaccine - 1 dose.
DO NOT receive any other vaccines (except flu or pneumococcal) until you have received both doses of the COVID-19 vaccine AND until 28 days after the second dose.
It is important to note that full protection takes days and not hours to develop after having received the vaccine. You are considered protected 2 weeks after having received your second dose (for vaccines requiring 2 doses) or 2 weeks after your unique Johnson & Johnson dose.
However, current efficiency data suggests an effective protection 3 weeks after having received the first dose. The second dose's purprose is mainly to make the duration of the long-term protection last longer and can be given up to 16 weeks after the first dose, depending on your province.).
It is recommended to receive 2 doses from the same vaccine, because no data on the interchangeability of vaccines currently exist. However, in the event that the same vaccine is not available, it is possible to use a vaccine of a similar type, e.g. any mRNA COVID-19 vaccines. The 2 doses you receive will be considered valid.