Ottawa: Provinces and territories should quickly get ready to offer fourth doses of COVID-19 vaccines in the coming weeks starting with people over the age of 80 and long-term care residents, the National Advisory Committee on Immunization recommended Tuesday.
NACI recommended that a second booster may be offered to people between 70 and 79 years of age, and to people from First Nations, Metis and Inuit communities.
“Preliminary data indicate that a second booster dose provides additional protection, including against severe disease,’’ the committee reported Tuesday.
In general, a second booster dose should be given 6 months after the patients got their first booster shots, NACI says, though that optimal timeline will need to be weighed against how rampant COVID-19 is at the local level.
The committee also suggests a recent COVID-19 infection should be factored in, since boosters are best offered at least three months after symptom onset or a positive test.
The latest NACI advice also said a second booster appears to be as safe as previous doses and is well tolerated.
The committee is still studying whether a second booster shot is necessary for younger adults and adolescents.
Second boosters, or fourth doses, are not approved by Health Canada but can still be offered on an “off-label’’ basis. The recommendations were made in light of the potential for waning effectiveness of booster doses against severe disease. Several provinces have already offered a second booster to higher-risk groups with plans to expand eligibility soon.
Approximately 90 per cent of Canadians over the age of 18 are considered fully vaccinated in Canada as of March 27, which for the majority of Canadians means two doses of the vaccines approved by Health Canada. NACI recommended a third shot for adults in December but people have been slower to get their boosters than they were to get the first and second doses.
Just 57 per cent of people over 18 years old have received a booster dose, according to data from the Public Health Agency of Canada.
Older people who are at higher risk of severe outcomes related to the virus have been more amenable to the idea of extra jabs, with more than 84 per cent of seniors over 70 getting a third dose and 68 per cent of those aged 50 to 69.
By Laura Osman
The Canadian Press