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Canada has just approved an updated COVID-19 vaccine to target the first highly contagious Omicron variant, with doses expected to start rolling out within days. But what exactly can we expect from these new shots when they land in the real world?
The updated Moderna vaccine is a combination of two strains, also known as a “bivalent” vaccine, that targets both the original virus and the Omicron variant BA.1 that emerged late last year and drove the largest wave of infection and hospitalization in the pandemic.
While the new shot doesn’t directly target dominant Omicron subvariants BA.4 and BA.5, which the U.S. approved an updated shot for this week, Pfizer submitted an application for Health Canada approval for its BA.4-5 vaccine Friday and Moderna is expected to soon.
“The evidence we have to date shows that the bivalent vaccine with BA.1 offers good protection against BA.4 and BA.5,” Deputy Chief Public Health Officer Dr. Howard Njoo said during a technical briefing Thursday.
“Certainly as the situation evolves we’ll have to look at the evidence and see what happens with real-world effectiveness.”
But what an updated booster can do for you depends on how vulnerable your immune system is, whether you’re one of the millions of Canadians who’ve recently been infected with COVID and when you last had a vaccine.
WATCH | Health Canada approves updated vaccine targeting Omicron variant:
Vaccine for Omicron variant approved by Health Canada
2 days ago
Duration 2:52
Health Canada has approved a new bivalent COVID-19 vaccine from Moderna, which targets the Omicron variant. It’s the first vaccine of its type in Canada, but officials say another batch of booster shots, specifically targeting Omicron’s BA.4 and BA.5 subvariants, could arrive later this fall.
Will updated vaccines stop COVID spread?
Infectious diseases experts, virologists, epidemiologists and immunologists are hopeful updated vaccines will be more effective at preventing transmission than the original shots — at least initially — but also caution Canadians not to expect them to be a silver bullet.
With limited data on the impact these vaccines will have, all eyes will be on the effect they have on slowing rates of infection and transmission and whether they better protect vulnerable groups in the population heading into the fall and winter months.
“We do not know what the impact is because that is not available,” Chief Public Health Officer Dr. Theresa Tam said during a news conference Thursday when asked by CBC News how effective the updated vaccines will be at stopping the spread of the virus.
Chief Public Health Officer Theresa Tam said she is hopeful that the new bivalent vaccine boosts protection against infection and transmission, at least through the fall. (Adrian Wyld/The Canadian Press)
Tam said she is hopeful that the new bivalent BA.1-targeted vaccine from Moderna boosts protection against infection and transmission — at least through the fall.
Clinical trial data on the BA.1-targeted vaccines from Moderna and Pfizer-BioNTech suggests they provide slightly stronger immune protection against Omicron than the original vaccines, but exactly what that translates to in the real world remains to be seen.
“The immune responses to these variant-tuned boosters are modestly encouraging, but we are still waiting for definitive clinical evidence,” said Dr. David Naylor, who co-chairs the federal government’s COVID-19 Immunity Task Force.
“That said, even if their marginal advantages are small, they could have a meaningfully positive impact if their novelty rekindles public interest in getting boosted.”
A new preprint modelling study, that has not been peer reviewed, suggested that updated vaccines may not be much more effective than existing boosters in a population with hybrid immunity from vaccination and infection — especially when it comes to protection against severe illness.
But that could still lead to significant protection at a population level, with the preprint also suggesting that for every 1,000 people vaccinated with an updated booster, an average of eight fewer people would be hospitalized compared with the original vaccines.
“We don’t know yet the magnitude of this improvement, but it will likely be pretty limited,” said Dr. Gaston De Serres, an epidemiologist at the Quebec National Institute of Public Health (INSPQ).
“Especially against severe outcomes like hospitalization for which, up until now, the original [vaccines] have been quite successful.”
What can updated COVID vaccines do for you?
More than half of Canadians have been infected with COVID since the emergence of Omicron and its highly contagious subvariants, and the added protection from prior infection in a vaccinated population appears to be providing an edge.
A new research letter published in the New England Journal of Medicine looked at the risk of BA.5 infection among people in Portugal who had a prior infection with past variants, including BA.1 and BA.2, and found they had strong protection against the newer variant.
That’s in part because Portugal has such high levels of vaccination, with more than 98 per cent of the population studied having at least two doses, meaning that much like in Canada our high levels of two-dose vaccination and infection provide strong immune protection.
Two Canadian preprint studies from May and June, which have not been peer reviewed, also found prior Omicron infections provided robust immunity against future reinfection and hospitalization — especially when combined with vaccination.
“In general, we can anticipate that those who have hybrid immunity are going to be better protected,” said Dr. Danuta Skowronski, a vaccine effectiveness expert and epidemiology lead at the B.C. Centre for Disease Control and co-author of the preprints.
“And it is also true that vaccine strains that are a better match to the circulating variant will likely provide better protection.”
The longer you wait after your last infection or vaccination is also important to consider, with emerging evidence suggesting getting a booster too closely after being infected or vaccinated can impact how effective the shot is.
A new small preprint study, which has not been peer reviewed, found that getting a booster within two months of an infection could negatively impact B cells that help generate immune protection against severe disease.
“Timing is everything and in general the recommendations are to wait a few months following infection before receiving a booster dose,” Skowronski said.
She added that people shouldn’t immediately rush out to get a booster after infection because it could actually interfere with the immune response.
“As we start to head into the fall and we start to see almost certainly cases rise again, the updated booster is definitely going to be better than not getting a booster at all,” said Deepta Bhattacharya, an immunobiology professor at the University of Arizona.
“Given that BA.5 is still circulating, I don’t see that there’s really any downside at all to picking up these boosters and they’ll probably work better than just another shot of the original.”
Less than half of Canadians have received a booster even though it provides significant added protection against severe COVID-19. Only about 12 per cent have received a fourth dose. (Darryl Dyck/The Canadian Press)
Bill Hanage, an epidemiologist at Harvard’s T.H. Chan School of Public Health in Boston, said it’s important to consider that even though the original vaccines were far from an exact match to Omicron — they still provided strong protection against severe illness.
“But the closer matches now should do more,” he said in an email. “Notably, there may well be a period following the shot when people are immune to infection.”
Bhattacharya said the “big question” that is top of mind right now is how effective the updated vaccines will be at stopping transmission in the real world — and for how long.
“Do we start to restore some of the protection against any infection or symptomatic infection with these boosters? I expect we will,” he said. “Exactly how long that effect will last, I think, is to be determined.”
Dr. Allison McGeer, a medical microbiologist and infectious disease specialist at Toronto’s Mount Sinai Hospital, said the updated shots may provide a slight boost in neutralizing antibodies that can prevent transmission — and that added protection is “not nothing.”
“An extra dose of the original vaccine results in substantial increased protection against BA.4 and BA.5. It’s not perfect, but I think we’re finding out nothing is perfect,” she said. “The bivalent vaccines, they may be a little better, but they’re not going to be a miracle.”
Bhattacharya said that while clinical trials showed there is only about a twofold increase in protective antibodies against the BA.1, BA.4 and BA.5 variants targeted by Moderna and Pfiizer in their bivalent vaccines — it’s still significant protection.
“If you look at the data, it’s a ton more antibodies that are being made,” he said. “So I have every reason to expect that they will help — and probably help a lot.”
VANCOUVER – Contract negotiations resume today in Vancouver in a labour dispute that has paralyzed container cargo shipping at British Columbia’s ports since Monday.
The BC Maritime Employers Association and International Longshore and Warehouse Union Local 514 are scheduled to meet for the next three days in mediated talks to try to break a deadlock in negotiations.
The union, which represents more than 700 longshore supervisors at ports, including Vancouver, Prince Rupert and Nanaimo, has been without a contract since March last year.
The latest talks come after employers locked out workers in response to what it said was “strike activity” by union members.
The start of the lockout was then followed by several days of no engagement between the two parties, prompting federal Labour Minister Steven MacKinnon to speak with leaders on both sides, asking them to restart talks.
MacKinnon had said that the talks were “progressing at an insufficient pace, indicating a concerning absence of urgency from the parties involved” — a sentiment echoed by several business groups across Canada.
In a joint letter, more than 100 organizations, including the Canadian Chamber of Commerce, Business Council of Canada and associations representing industries from automotive and fertilizer to retail and mining, urged the government to do whatever it takes to end the work stoppage.
“While we acknowledge efforts to continue with mediation, parties have not been able to come to a negotiated agreement,” the letter says. “So, the federal government must take decisive action, using every tool at its disposal to resolve this dispute and limit the damage caused by this disruption.
“We simply cannot afford to once again put Canadian businesses at risk, which in turn puts Canadian livelihoods at risk.”
In the meantime, the union says it has filed a complaint to the Canada Industrial Relations Board against the employers, alleging the association threatened to pull existing conditions out of the last contract in direct contact with its members.
“The BCMEA is trying to undermine the union by attempting to turn members against its democratically elected leadership and bargaining committee — despite the fact that the BCMEA knows full well we received a 96 per cent mandate to take job action if needed,” union president Frank Morena said in a statement.
The employers have responded by calling the complaint “another meritless claim,” adding the final offer to the union that includes a 19.2 per cent wage increase over a four-year term remains on the table.
“The final offer has been on the table for over a week and represents a fair and balanced proposal for employees, and if accepted would end this dispute,” the employers’ statement says. “The offer does not require any concessions from the union.”
The union says the offer does not address the key issue of staffing requirement at the terminals as the port introduces more automation to cargo loading and unloading, which could potentially require fewer workers to operate than older systems.
The Port of Vancouver is the largest in Canada and has seen a number of labour disruptions, including two instances involving the rail and grain storage sectors earlier this year.
A 13-day strike by another group of workers at the port last year resulted in the disruption of a significant amount of shipping and trade.
This report by The Canadian Press was first published Nov. 9, 2024.
The Royal Canadian Legion says a new partnership with e-commerce giant Amazon is helping boost its veterans’ fund, and will hopefully expand its donor base in the digital world.
Since the Oct. 25 launch of its Amazon.ca storefront, the legion says it has received nearly 10,000 orders for poppies.
Online shoppers can order lapel poppies on Amazon in exchange for donations or buy items such as “We Remember” lawn signs, Remembrance Day pins and other accessories, with all proceeds going to the legion’s Poppy Trust Fund for Canadian veterans and their families.
Nujma Bond, the legion’s national spokesperson, said the organization sees this move as keeping up with modern purchasing habits.
“As the world around us evolves we have been looking at different ways to distribute poppies and to make it easier for people to access them,” she said in an interview.
“This is definitely a way to reach a wider number of Canadians of all ages. And certainly younger Canadians are much more active on the web, on social media in general, so we’re also engaging in that way.”
Al Plume, a member of a legion branch in Trenton, Ont., said the online store can also help with outreach to veterans who are far from home.
“For veterans that are overseas and are away, (or) can’t get to a store they can order them online, it’s Amazon.” Plume said.
Plume spent 35 years in the military with the Royal Engineers, and retired eight years ago. He said making sure veterans are looked after is his passion.
“I’ve seen the struggles that our veterans have had with Veterans Affairs … and that’s why I got involved, with making sure that the people get to them and help the veterans with their paperwork.”
But the message about the Amazon storefront didn’t appear to reach all of the legion’s locations, with volunteers at Branch 179 on Vancouver’s Commercial Drive saying they hadn’t heard about the online push.
Holly Paddon, the branch’s poppy campaign co-ordinator and bartender, said the Amazon partnership never came up in meetings with other legion volunteers and officials.
“I work at the legion, I work with the Vancouver poppy office and I go to the meetings for the Vancouver poppy campaign — which includes all the legions in Vancouver — and not once has this been mentioned,” she said.
Paddon said the initiative is a great idea, but she would like to have known more about it.
The legion also sells a larger collection of items at poppystore.ca.
This report by The Canadian Press was first published Nov. 9, 2024.
