Recent studies show a drop in effectiveness for COVID-19 vaccines, but the lack of information about how severe breakthrough cases were has sparked a debate about whether booster shots are necessary.
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The National is CBC’s flagship nightly news program, featuring the day’s top stories with in-depth and original journalism, with hosts Adrienne Arsenault and Andrew Chang in Toronto, Ian Hanomansing in Vancouver and the CBC’s chief political correspondent, Rosemary Barton in Ottawa.
