LONDON, United Kingdom (AFP) — Britain on Monday appealed for a person infected with a powerful Covid-19 strain from Brazil to come forward, as experts fretted about its impact on new vaccines. The public appeal came a week before England is due to start slowly unwinding its third Covid lockdown, with progress hinging on the vaccines’ ability to curtail the pandemic. The variant that emerged in Manaus, northern Brazil, has been detected in six people […]