Tlhahlobo ea CNN e bonts'a hore tlhahlobo ea antigen ea Covid-19 ha e kenyellelitsoe maemong a linaha tse ling

(CNN) Palo eohle ea linyeoe tsa Covid-19 liprofinseng tse ling e ntse e sa kenyelletse liphetho tsa liteko tsa antigen - leha e le joalo ka ha ho khothalelitsoe ke Litsi tsa US tsa Taolo le Thibelo ea Mafu.