The infected group included two of the cardiologist’s three sons. None of the other adults caught the coronavirus on the trip, the cardiologist told me, which she points to as “total proof that the vaccine worked.” ( The Atlantic agreed not to name the cardiologist to protect her family’s privacy.) But within a week, six of the eight kids on the trip-all of them too young to be eligible for vaccines-had newly diagnosed coronavirus infections as well. A test soon confirmed a mild breakthrough case of COVID-19. Then, on the last night of the outing-July 27, the same day the CDC pivoted back to asking vaccinated people to mask up indoors-one parent started feeling sick. The group spent most of the trip outdoors, biking, swimming, and hiking. It was, in many ways, a fairly pandemic-sanctioned vacation: All nine adults in attendance were fully vaccinated. Nearly 77 per cent of the cases analyzed in the study, which ended before delta firmly took hold on Ontario's caseload, were infected with alpha, beta or gamma variants while 2.8 per cent were classified as "probable Delta infections." Roughly 22 per cent were infected with non-variants.įisman and his team found the delta variant was present in Ontario by April 2021 and became the dominant strain by July.Two and a half weeks ago, as the next school year approached, a pediatric cardiologist from Louisiana headed into the Georgia mountains with her husband, their three young children, and their extended family. "We're sort of expecting to see a bit of a bump in case numbers after Thanksgiving, so it'll be interesting to see whether or not that pans out." Other variants overtaken by delta "Non-vaccinated adults are potentially creating risk for those around them," he said. SECOND OPINION Yes, vaccines curb COVID-19 transmission - but that's not enough to protect those without a shotįisman said Thanksgiving gatherings can be risky if they involve mingling of vaccinated and unvaccinated adults, but danger can be mitigated by eating dinner outdoors if weather permits, keeping windows open or using air filtration systems as "your next line of defence." The University of Toronto epidemiology professor said that could be an important factor for some to more strongly consider the risk that delta carries and get vaccinated. Some of the findings echo results from previous research papers published across the globe, but co-author David Fisman believes the study is the first large-scale analysis to include Canadian data. They found that those infected with the alpha variant, which drove the province's third wave in the early spring, or the beta or gamma variants were 52 per cent more likely to be hospitalized, 89 per cent more likely to need intensive care and 51 per cent more likely to die of the infection than those who caught the early 2020 version of the virus.Īmong delta cases, they found a 108 per cent increased risk for hospitalization, 235 per cent increased risk for ICU admission and 133 per cent increased risk for death compared to the original virus strain. The study, conducted by researchers at the University of Toronto and published Tuesday in the Canadian Medical Association Journal, analyzed more than 212,000 cases of COVID-19 reported in Ontario between Feb. A new study using Canadian data suggests the delta variant of the COVID-19 virus causes more serious disease and is associated with an increased risk of death compared to previous strains - dangers that are drastically reduced with vaccination.
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