Covid news live: Omicron probably present in most countries; US death toll passes 800,000

The US records the highest number of coronavirus deaths in the world; Omicron variant is spreading at an unprecedented rate, WHO chief warns The United States has surpassed 800,000 coronavirus-related deaths UK Omicron infections 'could reach 1m a day by end of December' Denmark and Norway rush in stricter Covid measures as cases soar South Africa's previous infections may explain Omicron hospitalisations Pfizer says pill effective in protecting against severe disease from Covid See all our coro...