![]() ![]() For Moderna's it was about 80 per cent after one dose and 94 per cent following the second. What's the scientific basis for delaying?Ĭhakrabarti says there's evidence, for example, to support delaying the second dose of the Hepatitis A vaccine by six to 36 months, and that's true for other vaccines, too. But the COVID-19 vaccines haven't existed long enough to know.Įfficacy for Pfizer-BioNTech's vaccine was around 95 per cent after both doses and 52 per cent after the first, according to clinical data. Both Pfizer and Moderna acknowledge that, in a pandemic, health authorities will make their own recommendations. Health Canada approved the vaccines based on that clinical trial data. For AstraZeneca-Oxford's, the interval is eight to 12 weeks. Pfizer-BioNTech's vaccine is meant to be given as two doses, 21 days apart, while Moderna recommends 28 days. Vaccine-makers tested their shots in clinical trials with certain times between doses. I think that we don't want to stray too far away." What's the basis for the recommended dosing schedule? "But keeping that in mind, we do have to be careful. "We do know from other vaccines that increase in the interval between two shots doesn't have any major consequence in decreasing efficacy and in some situations might actually make it better," he said. David Naylor, Co-Chair of the COVID-19 Immunity Task Force, joined Power & Politics Wednesday to discuss the National Advisory Committee on Immunization's new recommendation that second doses of COVID-19 vaccines can be administered up to four months after the first dose. WATCH | Delaying 2nd doses defensible, expert says:ĭuration 2:34 Featured VideoDr. Sumon Chakrabarti, an infectious diseases physician in Mississauga, Ont., says the top priority is to protect older individuals and those who are at highest risk of severe consequences, hospitalizations and death.Ĭhakrabarti said the principle of getting as many people covered with one dose is a good one. Supriya Sharma, Health Canada's chief medical adviser, told CBC Radio's The Current on Wednesday that all provinces are looking at waiting longer to give second doses. Health officials in Alberta, Manitoba and Newfoundland and Labrador announced they're moving to a four-month interval.ĭr. National advisory committee recommends stretching interval between vaccine doses to 4 monthsĭoing so creates opportunities to protect all of Canada's adult population more quickly, NACI said.ĭr.On Wednesday, the National Advisory Committee on Immunization (NACI) said it "recommends that in the context of limited COVID-19 vaccine supply, jurisdictions should maximize the number of individuals benefiting from the first dose of vaccine by extending the interval for the second dose of vaccine to four months." Njoo said experts are balancing vaccinating a large number of Canadians to achieve a good level of protection without compromising the effectiveness of the vaccines. We're seeing quite a high level of protection." "We have real-world data, the actual experience of what's happening with the vaccination, for example in British Columbia and in Quebec, as they're vaccinating seniors in long-term care facilities. "What's happening is, I think, very encouraging," Njoo said in a briefing on Tuesday. A health-care worker prepares to administer a dose of the AstraZeneca-Oxford vaccine, in Santiago, Dominican Republic, in February.
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