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British study shows COVID-19 vaccine efficacy wanes...

A British public health study has found that protection from either of the two most commonly used COVID-19 vaccines against the now prevalent Delta. ....

United Kingdom , Oxford University , ஒன்றுபட்டது கிஂக்டம் , ஆக்ஸ்ஃபர்ட் பல்கலைக்கழகம் ,