Unvaccinated people are more likely to catch COVID-19, but by how much? The answer has changed in recent months.
Unvaccinated people are statistically more likely to catch COVID-19, according to Santé Quebec. But by how much? The answer has changed in recent months, as efficacy wanes and variants emerge, among other factors.
Quebec public health reported Friday that unvaccinated people are 3.8 times more likely to catch COVID-19 than those who are fully vaccinated.
While that’s still a significant jump in risk, it’s lower compared to months ago when the vaccine was still fresh in Quebecers’ arms. For example, on Aug. 25, unvaccinated people were 8.2 times more likely to get sick than those with two shots.
Still, the vaccine offers good protection against serious symptoms – as of Friday, unvaccinated people were 14.8 times more likely to wind up in hospital after getting sick.
But as cases ramp up again in Quebec, and the new Omicron coronavirus variant causes a worldwide stir, should people be worried about the vaccine’s apparently decreased protection?
“If you've gotten your two doses, and you are otherwise healthy, I think you can be relatively confident that you have good protection against COVID-19,” said Dr. Christopher Labos, a Montreal cardiologist with a degree in epidemiology.
"There is waning efficacy to vaccines," he continued. "They are still highly effective, but with time, as people get further and further away from their second dose, vaccine efficacy does decrease a little bit."
There are a number of factors that play into how protective a vaccine is, Labos said. For example, different demographics are at different levels of risk, each group bares different vaccination rates, and the Delta variant has changed how quickly the virus can spread.
Still, for any number of reasons, the coronavirus is spiking in Quebec. Despite the fact that eight in 10 Quebecers aged 5 and up are fully vaccinated, “the pandemic is not over,” Labos said.
WHAT SHOULD QUEBEC DO ABOUT THE NEW VARIANT?
A new variant is spreading quickly through southern Africa, prompting Canadian officials to halt travellers from affected regions from entering Canada.
As of Friday, there were no recorded cases of the new variant in Canada, but that could change.
Canada’s Chief Public Health Officer, Dr. Theresa Tam said on Friday it’s going to be “very difficult” to keep the mutation out of Canada “entirely,” but that screening and isolation measures are already being put in place at the border.
“The border is never 100 per cent, but each layer provides an additional layer of protection,” she said.
So, what should Quebec do to prepare, should the variant arrive?
“I don't think it's anything that should be affecting our course of action right now,” Labos said.
While Quebecers might be tired of hearing it, Labos says the best thing to do remains the same: wear a mask, keep your distance, and get vaccinated, if you haven’t already.
TIME FOR A THIRD SHOT?
If time is a determining factor in vaccine efficacy, could Quebec start rolling out third doses to better protect its residents?
Yes and no, according to Labos.
While the province has already begun offering booster shots to certain groups, such as people with compromised immune systems, Labos says opening that up to the general population might not be the best course of action.
“You do see a boost in your antibody levels after you get a booster. There's very little controversy there,” he said. “The point, though, is that you don't want to give boosters where they're not going to be effective.”
“When you have a finite resource, like vaccine doses are, we also get a lot of benefit from vaccinating people in other countries,” he said.
In South Africa, where the new Omicron variant was discovered, just 24 per cent of residents are fully vaccinated. In Zimbabwe, another area from which travellers are being turned away, it’s just 18 per cent. In Mozambique, just one in 10 residents are fully protected.
“If we could vaccinate everyone, in all of these countries, new variants would stop emerging,” said Labos.
At the moment, Canada does donate hundreds of thousands of doses to countries where vaccination rates are lower.
A breakdown of where those vaccines are going can be found here.
“When you look at the situation globally, you clearly derive more benefit when you give somebody their first dose compared to when you give somebody their third dose,” Labos continued.
“We have to stop thinking of this as a Canadian problem or a Quebec problem and really look at this as a global problem.”
CTVNews.ca Top Stories
BREAKING Health Canada to change sperm donor screening rules for men who have sex with men
Health Canada will change its longstanding policy restricting gay and bisexual men from donating to sperm banks in Canada, CTV News has learned. The federal health agency has adopted a revised directive removing the ban on gay, bisexual and other men who have sex with men, effective May 8.
American millionaire Jonathan Lehrer denied bail after being charged with killing Canadian couple
American millionaire Jonathan Lehrer, one of two men charged in the killings of a Canadian couple in Dominica, has been denied bail.
LeBlanc says he plans to run in next election, under Trudeau's leadership
Cabinet minister Dominic LeBlanc says he plans to run in the next election as a candidate under Prime Minister Justin Trudeau's leadership, amid questions about his rumoured interest in succeeding his longtime friend for the top job.
U.S. vetoes a widely supported UN resolution backing full membership for Palestine
The United States has vetoed a widely backed UN resolution that would have paved the way for full United Nations membership for the state of Palestine.
Grandparent scam suspects had ties to Italian organized crime, police allege
A group of suspects that allegedly defrauded seniors across Ontario and other parts of Canada using a so-called emergency grandparent scam appear to have ties to 'Italian traditional organized crime,' according to an investigator involved in the OPP-led probe.
Sports columnist apologizes for 'oafish' comments directed at Caitlin Clark. The controversy isn’t over
A male columnist has apologized for a cringeworthy moment during former University of Iowa superstar and college basketball’s highest scorer Caitlin Clark’s first news conference as an Indiana Fever player.
Cat found on Toronto Pearson airport runway 3 days after going missing
Kevin the cat has been reunited with his family after enduring a harrowing three-day ordeal while lost at Toronto Pearson International Airport earlier this week.
Trend Line Anger, pessimism towards federal government reach six-year high: Nanos survey
Most Canadians in March reported feeling angry or pessimistic towards the federal government than at any point in the last six years, according to a survey by Nanos Research.
B.C.'s short-term rental regulations include $10K daily penalties for Airbnb, other platforms
Short-term rental platforms that violate B.C.'s pending regulations can face administrative penalties of up to $10,000 per day, officials announced Thursday.