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Do vaccines prevent disease or infection? And how long does immunity last? Your COVID-19 vaccine questions answered – ABC News

Do vaccines prevent disease or infection? And how long does immunity last? Your most common COVID-19 vaccine questions, answered.

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The news of multiple experimental COVID-19 vaccines showing early signs of promise has triggered a wave of optimism in recent weeks and a lot of questions.
Late yesterday, Oxford University and AstraZeneca announced their coronavirus vaccine is 70 per cent effective at stopping people getting sick, and 90 per cent effective under one dosing regime.
This news follows similarly positive developments from Pfizer, which became the frontrunner in the global vaccine race when it released preliminary data…

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