Booster vaccine only needed if variants emerge, UK health official says
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Immunity to Covid-19 after jab lasts much longer than previously thought
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Immunity to Covid-19 after jab lasts much longer than previously thought
Full ArticleThe Gamaleya National Research Center of Epidemiology and Microbiology of the Ministry of Health of the Russian Federation and the..
In some Asia-Pacific countries, the unpleasant memory of the pandemic is receding; elsewhere, second or third waves of infections..