While omicron subvariant BA.5 has revealed itself to be the most contagious and immune-evasive iteration of COVID-19 yet, scientists have known for a long time that many cases of COVID-19, regardless ...

Researchers published in the British Medical Journal (BMJ) have found infection or vaccination with the omicron variant of COVID-19 do little or nothing to protect against future infections. According ...

The omicron variant of the coronavirus has been dominant in the U.S. since December, but the version of omicron that drove the major infection surge during the winter now accounts for less than 2 ...

So-called "natural immunity" against COVID-19 has always been a dodgy argument for avoiding vaccination during the pandemic. But amid omicron, natural immunity is clearly rubbish. Unvaccinated people ...

The latest Omicron subvariant, XBB.1.5, is the most transmissible strain of COVID yet — but does not seem to make people sicker, the World Health Organization has said. XBB.1.5 has spread quickly ...

The omicron variant of Covid-19 appears less likely than delta to lead to long Covid, according to British researchers. But because omicron is much more contagious than previous variants, the enormous ...