Coronavirus antibodies decline after infection, study finds, raising questions about herd immunity CNBCBritish study shows evidence of waning immunity to Covid-19 CNNStudy: Covid-19 Immunity May Wear Off After Infection ForbesStudy Shows Covid-19 Antibodies Waning Over Time, Suggesting Immunity May Wear Off msnNOWCovid: Antibodies 'fall rapidly after infection' BBC NewsView Full Coverage on Google News