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Coronavirus in Canada: Look first at how many antibodies are prevalent among adults

 


TORONTO – A recent blood donation test reveals little evidence of infection spread by the new coronavirus, scientists said on Thursday.

The Canadian Blood Services and Canada COVID-19 Immunity Task Force found that less than one percent of the 10,000 samples tested so far tested positive for SARS-CoV-2 antibodies, which are present in anyone who has fought against the virus.

Although the percentage is small, it is still troubling because it suggests there are “some undetected infections” for every confirmed Canadian case of COVID-19, said the co-chair of the workforce, Dr. David Naylor. in a press release. More than 112,000 Canadian cases had been confirmed as of Thursday morning, representing about 0.3 percent of the total population.

The fact that more than 99 percent of donated blood samples do not contain antibodies that protect against SARS-CoV-2 should also serve as a warning to most Canadians as the country reopens, said force co-chair Dr. Catherine Haskins in the announcement.

“So far, most of us remain susceptible to infection,” she said.

“We need to increase testing and tracking capacities across the country to quickly disrupt any transmission chain to prevent uncontrolled spread.

All tested samples were donated between May 9 and June 8, shortly after virus activity peaked in Canada. The series does not include any samples from Quebec, which has been the most hit province. The results from Quebec are expected to be made public “in the near future”, according to the press release from the working group.

Further nationwide data is also coming in, as the Canadian Blood Services is working on testing all 37,800 blood samples donated during May and June.

It is not yet clear how long the antibodies produced to help the body fight SARS-CoV-2 infection last. The study published this week in the New England Journal of Medicine suggests that half of the antibodies disappear within 36 days.

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