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But almost 30 years of research and surveillance have made it clear that people who previously weren't eligible to donate under the travel criteria can do so safely, said Dr. Aditi Khandelwal, medical officer for Canadian Blood Services.

"By removing that criteria, we will not impact the safety of the blood supply. But what we may be able to do is improve access to being a donor for many, many new people and even donors who have been recently deferred from donation for these reasons," said Khandelwal, who is also a hematologist and blood transfusion physician in Toronto.

"This is a massive effort on the part of many, many people (including) experts in Canada and across the world to understand this particular issue," she said, noting that both the United States and Australia lifted similar donation bans in 2022.

The news came hours after Health Canada authorized Héma-Québec — which manages the blood supply in Quebec — to remove the same ban.

The change takes effect across the country on Dec. 4.

Since 2003, an estimated 70,000 people in Canada have been prevented from donating blood because their travel history in the United Kingdom, Ireland or France made them ineligible, said Ron Vezina, vice-president of public affairs at Canadian Blood Services.

About 7,500 people have been turned away in the last five years or so, he said, noting they are still listed in the blood agency's system and may be contacted with a request to consider a donation.

The number of people across Canada who will now be able to donate blood is likely "a lot larger," Vezina said.

"The great unknown for us is how many people out there (have) self-deferred. They had just heard about this (ban) through someone else or they never even tried to give blood because they just assumed they were ineligible."

There is a big need for more blood donors in Canada, Vezina said. With only one out of 81 eligible people in Canada currently donating, the blood supply depends on a "small army."

"Everyone thinks that someone else has got it covered or is doing it," he said.

"The more people we can get to join the ranks and alleviate some of the pressures on that small army, the more resilient we'll be for Canada's needs in (blood) transfusion."

The people who may become newly eligible to donate blood as of Dec. 4 are those who spent a total of three months or more in the U.K. between Jan. 1, 1980, and Dec. 31, 1996, or received a transfusion there.

Those who spent a total of five years or more in France or the Republic of Ireland between 1980 and 2001, or received a transfusion there, may also be eligible to donate.

People who spent extended time in those countries were assumed to be more likely to have eaten beef products from cows that had bovine spongiform encephalopathy at a time when very little was known about the disease, said Khandelwal.

There have been 231 cases of variant Creutzfeldt-Jakob disease from eating cow products worldwide, she said.

There have been two cases of the disease in Canada. One had lived in the U.K. and the other had lived in Saudi Arabia and consumed beef imported from the U.K. Those cases happened in 2002 and 2011, respectively, Khandelwal said.

It's now known that the average time from exposure to developing the illness is eight and a half years, she said, and that it can be fatal within about 14 months.

That means people who lived in the high-risk countries in the 1980s and 1990s would have developed the disease long before now, she said.

An additional safeguard is the fact that white blood cells are reduced or removed from blood donations before transfusion, Khandelwal said.

This report by °µÍø½ûÇø was first published Nov. 22, 2023.

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