Omicron: What we know and what we don’t
Omicron is a variant of Covid-19 first sequenced in South Africa with cases now present in dozens of countries. This is what we know and what questions surround the new version of the virus.
More variants but delta still dominates
A new variant of Covid-19 detected in South Africa known as B.1.1.529 has caused flight bans and a scramble to determine vaccine efficacy, but will it overtake delta as the dominant strain of the virus?