Do you need a 4th dose of a COVID-19 vaccine? There's no one-size-fits-all answer

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https://i.cbc.ca/1.5942212.1615400594!/cumulusImage/httpImage/image.jpg_gen/derivatives/16x9_460/covid-vaccines-canadian-martyrs-seniors-residence.jpg In multiple countries, fourth doses are being explored as a way to ward off waning immunity. So does that mean you should rush out and get another shot if the opportunity arises? Not necessarily.


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