A second version of omicron is spreading. Here's why scientists are on alert
Pfizer and BioNTech begin testing an omicron-specific COVID-19 vaccine
Omicron survives longer on plastic, skin than prior variants; nose swabbing found best for rapid tests
Do not assume COVID pandemic reaching 'end game', warns WHO
WHO chief warns against talk of ‘endgame’ in pandemic
COVID-19: Elimination isn't 'going to be possible with this virus,' virologist says
2 years after 1st COVID case, US is battling biggest surge
Booster longevity: Data reveals how long a third shot protects
Scientist see decline in Covid ahead as infections drop in parts of the world
WHO counts 18 million virus cases last week as Omicron slows
Fauci says COVID-19 won't go away like smallpox, but will more likely become endemic
CDC warns 'the war has changed' as delta variant continues to spread
Omicron much weaker coronavirus variant than Delta, new study says — but some still urge caution
When am I contagious if infected with omicron?
Fact check: The theory that SARS-CoV-2 is becoming milder