British study shows evidence of waning immunity to Covid-19 CNNStudy Shows Covid-19 Antibodies Waning Over Time, Suggesting Immunity May Wear Off msnNOWVERIFY: Study shows mouthwash may inactivate coronavirus, but not a cure KSDK NewsAsymptomatic virus sufferers lose antibodies sooner: Study - The Jakarta Post Jakarta PostGroup sees 14% increase in child Covid-19 cases with close to 800,000 US kids infected CNNView Full Coverage on Google News