Are all COVID-19 vaccines created equal?

Image | Virus Outbreak Italy Vaccine

Caption: A health worker holds up a dose of the AstraZeneca vaccine against COVID-19 to be administered to members of the Italian Army at a vaccination center set up at the military barracks of Cecchignola, in Rome, Tuesday, Feb. 23, 2020. (Cecilia Fabiano/LaPresse/The Associated Press)

How solid is the science behind delaying second COVID-19 vaccine doses? Are the shots from AstraZeneca-Oxford and Johnson & Johnson effective enough?
Dr. Isaac Bogoch, an infectious diseases specialist at Toronto General Hospital and a member of Ontario's COVID-19 vaccine task force, answers our most pressing questions about the latest vaccine news.
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