The University of Toronto study suggests that even with high immunization rates, unvaccinated people threaten the safety of people vaccinated against the COVID-19 virus. Attack rates among those who are vaccinated against COVID-19 were highest when they were randomly mixed within the unvaccinated subpopulation. They were lowest when they were surrounded by others who were also vaccinated. For the unvaccinated, attack rates were lowest when mixing amid the vaccinated subpopulation. The findings remained consistent even when researchers modelled lower levels of vaccine effectiveness, such as in those who haven't received a booster dose or with the new variants of the virus. The lead auhor of the study said it’s unfortunate that the healthcare system is struggling because vaccination has become politicized.
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UofT suggests unvaccinated people increase risk of COVID-19 among vaccinated
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April 25, 2022