Dr. Supriya Sharma, chief medical adviser at Health Canada, holds a press conference in Ottawa on Friday, Feb. 26, 2021, to provide an update on the COVID-19 pandemic and vaccine rollout in Canada. THE CANADIAN PRESS/Sean Kilpatrick

Dr. Supriya Sharma, chief medical adviser at Health Canada, holds a press conference in Ottawa on Friday, Feb. 26, 2021, to provide an update on the COVID-19 pandemic and vaccine rollout in Canada. THE CANADIAN PRESS/Sean Kilpatrick

Chief medical adviser says Health Canada preparing for quick approval of boosters

There are three variants of concern now identified in Canada

Canada’s chief medical adviser says her department is constantly receiving and reviewing any data on vaccines and COVID-19 variants and will be ready to quickly authorize needed boosters when they’re available.

But Dr. Supriya Sharma said the three vaccines authorized in Canada so far offer excellent protection and, along with public health measures, can help slow the spread of the virus and potentially help stop it from mutating even further.

“We knew this was going to happen, that we would have variants,” she said, in an interview with The Canadian Press.

Coronaviruses don’t mutate as quickly as the flu, but do change as they spread among people and the more they spread, the more they change. To that end, Sharma said the slower the spread, the fewer variants we will see.

“So a virus is not going to mutate as much when it can’t replicate,” she said.

There are three variants of concern now identified in Canada, including B.1.1.7, first identified in the United Kingdom, B. 1.351, identified in South Africa, and P. 1, identified in Brazil.

Canada’s authorized vaccines, Pfizer-BioNTech, Moderna and Oxford-AstraZeneca, all appear to have very good results against B.1.1.7, which is the most common variant so far found in Canada.

Chief Public Health Officer Dr. Theresa Tam said Wednesday 1,324 cases of B.1.1.7, 103 B. 1.351 and 3 of P. 1 have been identified across Canada.

In Israel, where more than half the population has received at least one dose of the Pfizer-BioNTech vaccine, studies have shown significant reductions in the spread of the virus, as well as hospitalizations and deaths. The B.1.1.7 variant is dominant in Israel, making up more than 80 per cent of the cases there now.

The B. 1.351 variant is a bit more concerning for vaccines. South Africa stopped using AstraZeneca altogether after lab tests suggested it wouldn’t be very effective against mild illness for B. 1.351, which is dominant in that country.

That decision has contributed to growing concerns that AstraZeneca’s vaccine is less desirable but Sharma said the details aren’t that simple.

“Now, if you look at severe disease, or more severe cases, it actually looked like it was still quite protective,” she said.

“But in a country where that is your dominant circulating stream, and in a country where they had potentially had access to another vaccine shortly, they made the decision that maybe they weren’t going to go ahead with that,” she said.

If B. 1.351 becomes a dominant strain here, and the vaccines don’t show effectiveness against it, they’ll be pulled, she said.

”We wouldn’t leave a vaccine on the market, if we think that it wouldn’t be effective for the overall population,” she said.

All three vaccine makers have to keep updating Health Canada with any information they have about how their injections are handling new variants.

Most are also already working on boosters to address limitations their original vaccines may have.

When those boosters are ready, Health Canada won’t need very long to review them, said Sharma.

“We’re working with our international regulatory partners, to come together with aligned guidance, to provide to companies to give them some guidance on what type of evidence we would need to see for an updated vaccine,” she said.

Health Canada worked with both the U.S. Food and Drug Administration and the European Medicines Agency to establish similar guidelines for what companies had to do to get their COVID-19 vaccines approved the first time.

Canada’s authorizations were independent but were completed alongside the U.S. and Europe.

Any boosters would be handled in a similar way to how Health Canada manages the flu vaccine each year, which is adjusted annually to account for the changes in flu strains that are dominant.

Smaller-scale clinical trials and lab tests, that can be completed and reviewed much more quickly, are likely.

“They still need to demonstrate that the vaccine that comes out is still safe, effective and high quality,” she said.

READ MORE: Federal panel recommends 4-month gap between COVID vaccine doses due to limited supply

Mia Rabson, The Canadian Press


Like us on Facebook and follow us on Twitter.

Want to support local journalism during the pandemic? Make a donation here.

Coronavirusvaccines

Get local stories you won't find anywhere else right to your inbox.
Sign up here

Just Posted

Tim Schewe
Drivesmart column: Drivers who try to bulldoze through others

Inevitably I will end up with nothing but grille showing in my rearview mirror

X
Think on These Things: Truth is given to be shared

“Everyone is invited. Poor or wealthy. All need to recognize the authority of true goodness.”

B.C's COVID-19 dashboard shows the peaks and valleys of cases prior to the record daily report of 132 on April 9, 2021. (Dashboard image)
Interior Health has record day of COVID-19 cases

132 cases reported Friday, April 9, more deaths in Vernon hospital outbreak

A mushroom grower plans to plan new mushrooms in fallen trees in the Kaslo Community Forest. File photo
Kaslo mushroom farmer given green light for unique project

Robin Mercy will plant mushrooms in the Kaslo Community Forest

Alison Watson spotted this mama bear and her cub up an oak tree in Warfield last fall. Photo: Alison Watson
Secure your trash; Bears are awaking in Greater Trail and they’re hungry

Trash is the most reported attractant involved in human-bear conflicts

B.C. Health Minister Adrian Dix and Premier John Horgan describe vaccine rollout at the legislature, March 29, 2021. (B.C. government)
1,262 more COVID-19 infections in B.C. Friday, 9,574 active cases

Province’s mass vaccination reaches one million people

People walk past the Olympic rings in Whistler, B.C., Friday, May 15, 2020. Whistler which is a travel destination for tourists around the world is seeing the effects of travel bans due to COVID-19. THE CANADIAN PRESS/Jonathan Hayward
Adults living, working in Whistler, B.C., eligible for COVID-19 vaccine on Monday

The move comes as the province deals with a rush of COVID-19 and variant cases in the community

RCMP crest. (Black Press Media files)
UPDATE: RCMP investigating after child, 6, dies at motel in Duncan, B.C.

The BC Coroners Service is conducting its own investigation into the circumstances around the child’s death

RCMP display some of the fish seized from three suspects who pleaded guilty to violating the Fisheries Act in 2019, in this undated handout photo. THE CANADIAN PRESS/HO - RCMP
3 banned from fishing, holding licences after overfishing violations near Vancouver Island

Mounties seized the group’s 30-foot fishing vessel and all equipment on board at the time

B.C. Premier John Horgan responds to questions during a postelection news conference in Vancouver, on Sunday, October 25, 2020. British Columbia’s opposition Liberals and Greens acknowledge the COVID-19 pandemic has presented huge challenges for Horgan’s government, but they say Monday’s throne speech must outline a coherent plan for the province’s economic, health, social and environmental future. THE CANADIAN PRESS/Darryl Dyck
Horgan’s NDP to bring in throne speech in B.C., Opposition wants coherent plan

Farnworth said the budget will include details of government investment in communities and infrastructure

FILE - An arena worker removes the net from the ice after the Vancouver Canucks and Calgary Flames NHL hockey game was postponed due to a positive COVID-19 test result, in Vancouver, British Columbia, in this Wednesday, March 31, 2021, file photo. As vaccinations ramp up past a pace of 3 million a day in the U.S, the NHL is in a tougher spot than the other three major North American professional sports leagues because seven of 31 teams are based on Canada. (Darryl Dyck/The Canadian Press via AP, File)
Vancouver Canucks scheduled to practice Sunday, resume games April 16 after COVID outbreak

Canucks outbreak delayed the team’s season by eight games

Two-year-old Ivy McLeod, seen here on April 9, 2021 with four-year-old sister Elena and mom Vanessa, was born with limb differences. The family, including husband/dad Sean McLeod, is looking for a family puppy that also has a limb difference. (Jenna Hauck/ Chilliwack Progress)
B.C. family looking for puppy with limb difference, just like 2-year-old Ivy

Ivy McLeod born as bilateral amputee, now her family wants to find ‘companion’ puppy for her

Most Read