COVID-19 vaccine following a one-or-two-dose primary series, the Public Health Agency of Canada (PHAC) said Friday.Based on new recommendation from the National Advisory Committee on Immunization (NACI), Canada’s top doctor, Dr.
Theresa Tam, advised “an additional dose, or third dose of COVID-19 vaccine, for moderately or severely immunocompromised people who are more likely to have had a less than adequate immune response to the initial one or two dose COVID-19 vaccine series.” Ontario giving 3rd COVID-19 vaccine dose to high-risk people.