A resurgence of Covid-19 cases in Europe, this time driven by new, fast-spreading Omicron subvariants, is once again threatening to disrupt people's summer plans
Covid-19 is again surging in Western Europe due to a "perfect storm" of governments lifting restrictions, waning immunity and the more contagious BA.2 Omicron subvariant, experts say
Do vaccine mandates work? Austria is set to become the first country in Europe to impose Covid-19 vaccination and others could follow as nations scramble to inoculate their populations against coronavirus
Omicron is causing record numbers of cases around the world, and though it causes less severe Covid-19 experts warn this wave still threatens to overwhelm health systems
A month after it was first detected in southern Africa, Omicron is now known to be far more contagious than previous variants of Covid-19 but appears to cause a less severe illness than its predecessors
In October 2020, as scientists raced to develop a Covid shot, the head of the WHO warned against looming "vaccine nationalism". But is vaccine inequality the reason behind Omicron's emergence?