President Joe Biden will re-impose a Covid-19 travel ban on most non-US citizens who have been in Britain, Brazil, Ireland and much of Europe, a White House official said, as the new administration ramps up its pandemic response. Biden also on Monday extended the ban to travellers who have recently been to South Africa amid warnings that new, more transmissible coronavirus variants are already establishing themselves in the United States, the official said, confirming US media reports. The new president last week tightened mask-wearing rules and ordered quarantine for people flying...