Worldwide Covid cases surpass 500m as Omicron variant BA.2 surges

Global Covid-19 cases surpassed 500 million on Thursday, according to a Reuters tally, as the highly contagious BA.2 sub-variant of Omicron surges in many countries in Europe and Asia.

The rise of BA.2 has been blamed for recent surges in China as well as record infections in Europe. It has been called the "stealth variant" because it is slightly harder to track than others.