Vietnam's business hub – Ho Chi Minh City – has imposed new social distancing measures for 15 days from Monday to curb a new surge of COVID-19. It comes as 120 confirmed cases are being linked to a Christian congregation in the city, which the local government says accounts for most of the infections. City authorities have banned all public gatherings of more than 10 people and are considering slashing the number further to just five. Vietnam has said it's detected a new COVID-19 strain, which combines the variants first identified in Britain and India. Officials say the new hybrid strain can spread rapidly through the air.