New Covid Variant Omicron

Past COVID-19 infection does not provide protection from Omicron, say South African scientists

Much remains unknown about the new coronavirus variant, including whether it is more contagious, whether it makes people more seriously ill, and whether it can thwart the vaccine

Compulsory vaccinations and lockdowns: World struggles as Omicron and Delta variants spell return of unpopular curbs

With the Delta variant of COVID-19 pushing up cases in Europe and growing fears over Omicron, governments around the world are weighing new measures for populations tired of hearing about restrictions and vaccines