A new COVID-19 variant, named Omicron, is identified in South Africa and spreads rapidly around the world, leading to new travel restrictions and renewed concerns about the pandemic.
- https://www.who.int/news/item/28-11-2021-update-on-omicron
- https://www.cnn.com/world/live-news/covid-variant-omicron-11-29-21/index.html
- https://www.whitehouse.gov/briefing-room/statements-releases/2021/11/26/statement-by-president-joe-biden-on-the-omicron-covid-19-variant/
- https://nypost.com/2021/11/27/what-you-need-to-know-about-the-omicron-covid-19-variant/
