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Experts urge Ontarians not to hesitate to take Moderna for 2nd vaccine dose

Experts urge Ontarians not to hesitate to take Moderna for 2nd vaccine dose-Milenio Stadium-Ontario
Health experts say those who received Pfizer as a first dose should not hesitate if offered Moderna as their second dose. (Tyson Koschik/CBC)

Some health experts are urging Ontario adults booking their second COVID-19 vaccine to consider the Pfizer-BioNTech and Moderna shots interchangeable, as more people in the province become eligible for an earlier follow-up injection this week.

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As of 8 a.m. this morning, those who received their first dose of an mRNA vaccine on or before May 9 can book or reschedule their second dose at a shortened interval.

People in Delta variant hot spots who received first shots on or before May 30 can move up their second shots on Wednesday.

Health units covering Toronto, Peel, Halton, Porcupine, Wellington-Dufferin-Guelph, Waterloo and York, Hamilton, Simcoe-Muskoka and Durham are considered hot spots for the more infectious variant.

Toronto announced on the weekend it would scale up doses of the Moderna shot to offset a delay in the delivery of Pfizer doses to Ontario.

The province says this week’s shipment of Pfizer is behind by two to three days, but more than a million doses of Moderna arrived on Friday, so those will be used to supplement the delayed shots.

The government says residents over 18 who received the Moderna or Pfizer shot for their first dose can safely take either of the two vaccines for their second shot for strong protection. However, the Pfizer vaccine is currently the only one approved in Canada for use on youth, so those under 18 must stick with it for their second dose.

Since the announcement, several epidemiologists, family doctors and other health experts have urged Ontarians to get whichever of the two shots they’re offered as their second dose, saying the Pfizer and Moderna vaccines — both of the mRNA type — work essentially in the same way.

“With this week’s delayed Pfizer vaccine shipments, I’m concerned about people delaying dose 2 because they are being offered Moderna vaccine. The last thing we want is any loss of momentum in our flourishing vaccine rollout,” Dr. Jeff Kwong, an epidemiologist with the University of Toronto, said on Twitter.

Kwong said analyses of data compiled by the independent research organization ICES show that two doses of Moderna are “just as good” as two of Pfizer in preventing infections.

As a result, he said, “no reason to think that Pfizer for dose 1 + Moderna for dose 2 would be any worse than 2 doses of Pfizer,” he tweeted.

“So if you got Pfizer for dose 1 and are being offered Moderna for dose 2, rest assured that you are doing the right thing by getting it (and not waiting for Pfizer).”

Other experts expressed similar sentiment, noting people regularly get different brands of other vaccines without thinking twice about it.

“Just a reminder — if you got a flu shot this year, you likely don’t know the brand. Neither do I. They’re made by separate companies,” Dr. Zain Chagla, an infectious disease specialist at St. Joseph’s hospital in Hamilton, said in a tweet.

“Moderna and Pfizer are interchangeable.”

The province also said that starting sometime next week, it plans to allow all adults who received a first dose of Pfizer-BioNTech or Moderna’s product to book a second appointment as soon as 28 days after their initial shot.

As of last week, the province allowed people who received a first shot of the Oxford-AstraZeneca vaccine to book their second shot earlier.

They must wait at least eight weeks before getting their second dose.

CBC

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