All coverage
UK, Germany and Italy detect Omicron variant cases, Israel closes borders
By Costas Pitas, Toby Sterling & Madeline Chambers
Omicron: South Africa blasts travel bans as hospitals see surge of younger COVID patients.
By Daniel Politi
Omicron variant: COVID travel restrictions increasing
By Dawn Gilbertson
WHO skips two letters in alphabet in naming Omicron variant
By Mark Lungariello & Jon Levine
How variants like omicron develop and what makes them variants 'of concern'
By Jon Schuppe & Chantal Da Silva