The study, which has yet to be fully peer-reviewed, included more than 57,000 contacts from 24,000 households in which there was a lab-confirmed coronavirus case that had received a vaccination, compared with nearly one million contacts of unvaccinated cases. https://ift.tt/3sZLeLh
source https://michaelantonio.biz/2021/04/28/covid-one-dose-of-vaccine-halves-transmission-study/
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