Two doses of AstraZeneca Cov-19 vaccine show 85-90 per cent protection against symptomatic Covid-19: Study

London, May 21: Two doses of the Oxford/AstraZeneca vaccine have shown to prevent around 85 to 90 per cent of symptomatic COVID-19 infections, the first real-world data from Public Health England (PHE) has found. The method used for the

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