Coronavirus

Rising immunity and modest changes in behavior may explain why cases are declining, but much remains unknown, scientists say. After a brutal summer surge, driven by the highly contagious Delta variant, the coronavirus is again in retreat.

Coronavirus vaccine mandates imposed by employers seem to be working so far, suggesting that most vaccine holdouts would rather get the shot than lose their job.

For months we’ve been fixated on the idea that some people are at “high risk” and others aren’t. Now scientists have a better understanding of the continuum.

Governments around the world have created online tools for the public to view the latest data on Covid-19, but some platforms are better than others.

If nothing else, the Covid-19 virus has humbled experts who once confidently predicted its course, disregarding the lessons of history.