LONDON, Aug 19 ― 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 variant of the coronavirus weakens within three months.
That was down from 85 per cent and 68 per cent, respectively, seen two weeks after a second dose. The decline in efficacy was more pronounced among those aged 35 years and older than those below that age. The Oxford findings are in line with an analysis by the US Centers for Disease Control and Prevention and come as the US government outlines plans to make Covid-19 vaccine booster shots widely available next month amid a rise in Delta variant infections. It has cited data indicating diminishing protection from the vaccines over time.
“The fact that we do see ... more viral load hints that indeed herd immunity might become more challenging,” said co-author Koen Pouwels, also of Oxford University. The authors cautioned that the viral concentration in the throat was only a rough proxy for severity of symptoms and that they had no new data on the duration of infections.
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