All coverage
WHO's Tedros warns against over-reaction to Omicron
By Stephanie Nebehay
African leaders condemn travel bans from rich nations to stem omicron variant : Goats and Soda
By Joe Hernandez
Wealthy nations starved the developing world of vaccines. Omicron shows the cost of this greed
By Deborah Gleeson
COVID-19: How the spread of Omicron went from patient zero to all around the globe
By Philip Whiteside
How to pronounce omicron, the new COVID variant of concern
By Alix Martichoux
COVID: First signs that vaccines protect against Omicron
By Maayan Jaffe & Rossella Tercatin
Omicron variant likely to resist COVID vaccines as updated jabs months away, warns Moderna CEO
By Tom Bateman
Omicron Variant Symptoms and Covid-19 Vaccines: What to Know
By Sarah Toy & Daniela Hernandez
What We Know About Omicron, BA.4 and BA.5
By Andrew Jacobs, Carl Zimmer & Emily Anthes
'The world is watching South Africa': health experts sift Omicron clues
By Joseph Cotterill, John Burn-Murdoch & Oliver Barnes
Mask mandates to tackle Omicron come into force in England
By Alistair Smout & Paul Sandle
Omicron variant was detected in the Netherlands before S. Africa flights
By Bart H Meijer, Louise Heavens & Anthony Deutsch
Existing vaccines might not be as effective against omicron variant, Moderna CEO says
By Timothy Bella & Adela Suliman