Infectious diseases specialist Dr. Zain Chagla answers viewer questions about COVID-19 vaccine booster shots including whether everyone needs one right away.
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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.
