Here are the latest developments in the coronavirus crisis:

Scientists called for urgent action to improve public trust in immunisation as research suggested sizeable minorities in some nations may be reluctant to be vaccinated against Covid-19. 

British researchers on Tuesday said they hope to expose healthy volunteers to the virus that causes Covid-19 in a groundbreaking study to discover the amount needed for people to become infected.

Argentina surpassed one million coronavirus cases Monday, with areas outside the capital Buenos Aires bearing the brunt of recent infections.

Iran on Monday announced 337 deaths from the novel coronavirus, a record high for a single day in the Middle East country hardest hit by the Covid-19 pandemic.

The number of confirmed coronavirus cases worldwide passed 40 million on Monday, according to an AFP tally at 0715 GMT based on official sources.

Belgium imposed a nationwide overnight curfew on Monday as Switzerland made wearing face masks compulsory in indoor public spaces, the latest desperate measures by European governments to fight a powerful second coronavirus wave.

Here are the latest developments in the coronavirus crisis:

The coronavirus remains active on human skin for nine hours, Japanese researchers have found, in a discovery they said showed the need for frequent hand washing to combat the Covid-19 pandemic.

Israel started cautiously emerging from a second coronavirus lockdown Sunday after a month of tight restrictions, re-opening preschools, kindergartens, beaches and national parks, with numbers of new infections falling.