SARS-CoV-2, according to news agency PTI report. The researchers simulated mixing of like-with-like populations in which people have exclusive contact with others of the same vaccination status as well as random mixing between different groups.
David Fisman, from Dalla Lana School of Public Health at the University of Toronto, "many opponents of vaccine mandates have framed vaccine adoption as a matter of individual choice." Fisman said in a statement, "however, we found that the choices made by people who forgo vaccination contribute disproportionately to risk among those who do get vaccinated." Published in Canadian Medical Association Journal, the new study has found that the risk to vaccinated people was lower when unvaccinated mixed with unvaccinated.
But, when vaccinated and unvaccinated people mixed, a substantial number of new infections would occur in vaccinated people, even in scenarios where immunisation rates were high.
The findings remained stable even when they modelled lower levels of vaccine effectiveness for prevention of infection, such as in those who have not received a booster dose or with new SARS-CoV-2 variants.