NACI updates guidance on booster doses for people who have had COVID

Posted on: February 7, 2022

Canada's National Advisory Committee on Immunization (NACI) has updated its guidance on booster doses for people who have had COVID, and is now recommending they wait three months before getting a booster shot. In recommendations released today, NACI said a longer interval between infection and vaccination "may result in a better immune response, as this allows time for this response to mature in breadth and strength, and for circulating antibodies to decrease, thus avoiding immune interference when the vaccine is administered."

For vaccinated individuals aged 12 and older who are eligible for a third dose, the recommendations suggest waiting three months after the onset of symptoms, or following a positive test for anyone who was asymptomatic — while also being at least six months out from a second dose.

NACI also recommends those who experienced COVID infection before starting or completing their primary vaccine series may receive their next dose eight weeks after symptoms started or after testing positive.