Diseases, Conditions, Syndromes

Weak spot in COVID could guide vaccine advances

After three years of infections, lockdowns, and vaccinations, we know a lot about SARS-CoV-2, the virus that causes COVID-19—but we don't know everything. Like, why are some variants weaker than others? Why does the omicron ...

Diseases, Conditions, Syndromes

XBB.1.5, the most transmissible Covid subvariant yet

The Omicron subvariant XBB.1.5, the most transmissible COVID-19 subvariant so far, is spreading quickly across the United States and was predicted on Friday to become Europe's dominant strain in a matter of weeks.