A post hoc ergo propter hoc moment: Quebec City care home outbreak after COVID-19 vaccination was not because vaccine did not work; it did not have enough time to do so. It also did not cause the outbreak; you cannot get Covid-19 from the vaccine.

Medical Mythbusting Commentary for January 8, 2021

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Source:
Coronavirus outbreak grows in vaccinated Quebec City care home, expert says it was to be expected