S.Africa says vaccines, prior infection help mildness of COVID cases December 17, 2021December 17, 2021
In South Africa Omicron wave, Pfizer vaccine less effective against hospitalisation – study December 14, 2021
South Africa readies hospitals as Omicron variant drives new COVID-19 wave December 6, 2021December 6, 2021
First known U.S. Omicron case found in fully vaccinated overseas traveler December 2, 2021December 2, 2021