No Covid variant has emerged so far that undermines vaccine efficacy, but...: WHO chief's word of caution

No Covid variant has emerged so far that undermines vaccine efficacy, but...: WHO chief

source https://www.indiatoday.in/coronavirus-outbreak/story/covid-variant-vaccine-efficacy-who-vaccine-distribution-tedros-adhanom-ghebreyesus-1806558-2021-05-25?utm_source=rss

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