Monday, June 22, 2026

Omicron sub-variants

January 10, 2023

COVID-19: WHO backs mask-wearing on long flights amid U.S. spread of Omicron variant

The XBB.1.5 sub-variant, the most transmissible Omicron sub-variant, so far accounted for 27.6 per cent of COVID-19 cases in the U.S. for the week ending January 7.

A photo of passengers wearing face masks used to
May 5, 2022

COVID-19 cases increasing in Africa: WHO

COVID-19 cases and deaths continue to decline but omicron sub-variants are driving an increase in Africa and the Americas.

Health workers attending to Covid-19 patient