Canada approves the Johnson & Johnson vaccine, giving it a fourth option.

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Prime Minister Justin Trudeau announced on Friday that Canada’s health regulator had authorized the use of Johnson & Johnson’s single-dose vaccine, giving the country a fourth vaccine option.CreditCredit...Paul Chiasson/The Canadian Press, via Associated Press

Canada’s health regulator on Friday authorized the use of Johnson & Johnson’s single-dose vaccine. The move now gives the country, which has experienced a slow start to vaccinations, four inoculations to choose from.

“This is great news,” Prime Minister Justin Trudeau said at a news conference. He offered no projected date for the first deliveries.

Health Canada officials said that the vaccine has an overall effectiveness of 66.9 percent, much lower than the efficacy rates reached by Pfizer and Moderna vaccines. But it is similar to those vaccines in having a powerful ability to prevent severe disease, hospitalizations and death.

The United States and Bahrain have also authorized the Johnson & Johnson vaccine.

Production delays with the Pfizer and Moderna vaccines, combined with relatively modest initial shipments, have led to frustration among many Canadians — and put political pressure on Mr. Trudeau as Canada’s vaccination rate fell far behind that of the United States, Britain and other countries. As of Friday, 2.86 percent of all Canadians have received at least one dose.

Canada has ordered 10 million doses of the Johnson & Johnson vaccine and has options for another 28 million, a combined number that is slightly higher than the country’s population.

Depending on its arrival and combined with the need to only administer a single shot, the new vaccine may help significantly boost the country’s vaccination rate. The Johnson & Johnson vaccine also does not require extremely low storage temperatures, as the Pfizer vaccine does, making it easier to distribute to remote communities in Canada’s north.

Mr. Trudeau said that Pfizer would send 1.5 million doses, originally scheduled for delivery in the summer, over the next two months. Canada also received its first shipment this week of a version of the AstraZeneca vaccine, developed by the Serum Institute of India.

The Canadian government had initially promised to obtain six million doses of vaccines by the end of March. The new Pfizer schedule combined with AstraZeneca shipments, officials said, will raise that figure to eight million.

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