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Ontario Ministry of Health on Twitter: "Ontario is expanding eligibility for fourth doses of the #COVID19 vaccine! Starting April 7 at 8 a.m., individuals aged 60+ as well as First Nation, Inuit
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Israel to offer fourth dose of COVID vaccines as Omicron surges | Coronavirus pandemic News | Al Jazeera
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COVID-19 vaccination – Fourth COVID-19 vaccine dose | Australian Government Department of Health and Aged Care
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Fourth dose of COVID-19 vaccine reduced death among hospitalized patients during Omicron wave in Israel
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