Here's a look at the science behind COVID-19 variants, such as omicron and delta, and which coronavirus mutants are the most concerning in different areas.
Here are the most common COVID-19 symptoms for adults, kids, vaccinated individuals and omicron-variant infections.
As medical oxygen dwindles in Ukrainian hospitals, the WHO has called for setting up a safe transit route through neighboring Poland.
Cannabidiol (CBD), an active ingredient in cannabis, might help block infection with the virus that causes COVID-19.
Omicron is sweeping away the delta variant, having impacts on hospitalization and population immunity.