Pfizer and BioNTech will cut back on how many vials of COVID-19 vaccine they send Canada this year if the federal health regulator agrees to change the vaccine label to say every vial contains six doses instead of five.
Medical professionals in the United States were first to discover in December that they could get six doses from each vial by using smaller syringes or special ones that trap less vaccine around the needle after an injection.
Initially heralded as a way to stretch the precious vaccine even further, the company stepped in to note its contracts are for doses, not vials: If a recipient can get six doses instead of five, then Pfizer and BioNTech can ship fewer vials and still fulfil their contractual obligation.
Pfizer pushed the U.S. and Europe to change the label information on the number doses per vial and both did in early January. On Friday, Pfizer asked Canada to follow suit, and Health Canada’s vaccine regulatory team is now considering the request.
“The final decision on the label update will reside with Health Canada,” said Pfizer Canada spokeswoman Christina Antoniou.
If Canada agrees to the change, Canada’s 40 million doses of Pfizer-BioNTech’s vaccine will be shipped in about 6.7 million vials. Antoniou said if Canada does not, then the existing deliveries will continue based on five doses per vial, for a total of eight million vials.
“We will supply to Canada in line with our supply agreement and the label valid in the country,” she said.
Health Canada told medical professionals they could use sixth doses if they can get them from single vials, but advised against taking partial doses from multiple vials to make one dose due to the risk of cross-contamination.
There has been some success at doing this. Saskatchewan reports receiving 22,425 doses of Pfizer’s and 10,300 doses of Moderna’s vaccine, for a total of 32,725. But it has injected 34,080 doses. The government attributed that to being able to get more doses out each vial than expected.
But European health officials have complained that a shortage of the special syringes needed is making it hard to get six doses out of each vial.
If Canada agrees to the change but can’t get the six doses out of every single vial, its goal to vaccinate 20 million people with Pfizer’s 40 million doses will be impossible to meet.
Getting that extra dose requires the use of smaller syringes that allow less vaccine to go to waste with each injection. The best version is called a low-dead-volume syringe, which leaves less room for vaccine to get trapped in the needle and syringe after the plunger is pushed in all the way.
Those syringes are not as common as the three- and five-millilitre syringes mostly used in Canada’s vaccine campaign now, and the smaller ones have become the latest hot commodity of COVID-19.
Public Services and Procurement Canada tendered contracts last year for 145 million syringes, 95 million of which are of the three- or five-millilitre variety.
There are 50 million one-millilitre syringes on order, including 37.5 million low-dead-volume versions.
The department wouldn’t say how many syringes of each type have arrived in Canada. A tender for one-millilitre syringes issued in October set a deadline for the first 15 million to be delivered at the end of this month and the rest by the end of March.
But whatever contract awarded has not been made public, including who the supplier is, how much it is worth, or when the supplies will be delivered.
—With files from Stephanie Taylor in Regina
Mia Rabson, The Canadian Press
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