Unvaccinated people threaten the safety of vaccinated people even with high levels of immunization against Covid-19, according to a new study published in Canadian Medical Association Journal (CMAJ), countering a popular narrative that vaccination is purely is a matter of individual choice and supporting policies requiring the shots.

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Unvaccinated people pose a “disproportionate” risk of Covid-19 infection to vaccinated people, according to the peer reviewed study from University of Toronto researchers, which examined the interactions between unvaccinated and vaccinated groups using a computer model.

The model simulated the spread of Covid-19 under a variety of different parameters and mixing between unvaccinated and vaccinated people, including vaccine effectiveness and uptake, baseline levels of immunity among the unvaccinated and the rate of recovery from infection.

The model revealed a “markedly higher” risk of infection in all scenarios where unvaccinated and vaccinated people mixed, even the ones where immunization rates were high.

The findings counter the common argument that the decision to get vaccinated is a personal one, the researchers said, as the unvaccinated are “likely to affect the health and safety of vaccinated people in a manner disproportionate to the fraction of unvaccinated people in the population. ”


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