By Paul Vieira and Kim Mackrael 

OTTAWA -- A Canadian panel of scientists will recommend Monday a halt on administering the AstraZeneca PLC Covid-19 vaccine to people under the age of 55 in light of new research from Europe on potentially serious side effects for younger women, according to an official.

Canada's provinces, which are responsible for carrying out the Covid-19 vaccination rollout program, learned late Sunday night of the fresh guidance from federal authorities, which will advise that the vaccine only be administered to people age 55 and older. Canada had previously said the AstraZeneca vaccine was safe for people of all ages. The country's National Advisory Committee on Immunization will issue the new guidance later on Monday, the official said.

At least two Canadian provinces, Manitoba and Prince Edward Island, said they were immediately halting use of AstraZeneca on younger people.

"This is a pause while we wait for more information to better understand what we are seeing in Europe," said Dr. Joss Reimer, head of Manitoba's vaccine task force. "We have to respond to what we know, when we know it, in this vaccine campaign."

A representative for AstraZeneca wasn't immediately available for comment on Canada's recommendation.

Canada authorized use of the AstraZeneca vaccine, created in partnership with the University of Oxford, on Feb. 26. Health Canada -- which has oversight on drugs -- has repeatedly said the benefits of the vaccine outweighed any risks and stuck to that position while European countries paused AstraZeneca's use because of concerns about the risk of blood clotting in older people. The European Union's health agency later determined the shot was safe and effective and didn't increase the risk of blood clots.

Dr. Supriya Sharma, senior medical adviser at the country's health department, said last week that reports of blood clots after vaccination were very rare, but their unusual nature warranted further investigation. She said Health Canada would review evidence about the blood clots as it becomes available and would take action if new safety issues are confirmed.

Write to Paul Vieira at paul.vieira@wsj.com and Kim Mackrael at kim.mackrael@wsj.com

 

(END) Dow Jones Newswires

March 29, 2021 15:42 ET (19:42 GMT)

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