One dose of Pfizer or AstraZeneca vaccine was highly effective at preventing coronavirus in older people, real-world data from South Korea suggests

One dose of Pfizer or AstraZeneca vaccine was highly effective at preventing coronavirus in older people, real-world data from South Korea suggests

Business Insider

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It is not clear from South Korea's data how long protection against COVID-19 from a single shot lasts or the severity of illness it stopped.

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