The National Advisory Committee on Immunization (NACI) is now recommending that some immunocompromised people receive three doses of a COVID-19 vaccine.
that 鈥渕oderately to severely immunocompromised鈥 individuals who have not yet been immunized should receive three doses of an authorized mRNA vaccine. Those who have already completed a series of an mRNA or a viral vector vaccine should get an additional dose of an mRNA vaccine, NACI recommends.
Two mRNA vaccines, manufactured by Pfizer and Moderna, have been authorized for use in Canada.
NACI Chair Dr. Shelley Deeks said in a statement Friday that the recommendation is being made after a careful review of available data.
鈥淭his is not unusual for immunocompromised groups, where we often recommend different vaccine schedules to help them achieve better protection,鈥 Deeks said. 鈥淭his is different from a booster dose, which would be used to boost an immune response that has waned over time. NACI is also looking at whether booster doses might be needed for some key populations, but it is too early to comment on the state of the evidence for general boosters at this time.鈥
Canada鈥檚 Chief Public Health Officer Dr. Theresa Tam said there鈥檚 a 鈥渧ery broad鈥 group of individuals who may have an underlying condition or be undergoing medical treatments that compromise their immune systems. Examples include people being treated for solid tumours or blood malignancies and organ transplant recipients who take immunosuppressive drugs, she told reporters at a news conference Friday.
鈥淲hat the recommendation is, and how that is derived, is really looking at the fact that some of these individuals, through studies, have had a lower immune response to the initial one or two doses of COVID-19 vaccine compared to the general population,鈥 Tam said. She said recent, limited studies show that some of those individuals can have an increased immune response after a third vaccine dose.
Tam said immunocompromised individuals should talk to their health care providers to discuss their particular situations.
The province of Quebec is already offering booster shots for the and for travellers whose mixed dosing isn鈥檛 recognized in other countries. and are also rolling out third shots for eligible immunocompromised populations.
With files from Brooke Taylor
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