Pfizer Inc. signed a multi-year agreement to make Gilead Sciences Inc.’s antiviral drug remdesivir in a bid to ramp up supply of the Covid-19 treatment.

Researchers at the The Scripps Research Institute found that the strains spreading so quickly in Europe and the U.S. have a mutated S “spike” protein that makes it about 10 times more infectious than the strain that originally was identified in Asia.

The death toll from COVID-19 surpassed half a million people, according to a Reuters tally, a grim milestone for the global pandemic that seems to be resurgent in some countries even as other regions are still grappling with the first wave.

Global coronavirus cases exceeded 10 million on Sunday according to a Reuters tally, marking a major milestone in the spread of the respiratory disease that has so far killed almost half a million people in seven months.

Many studies assessing the accuracy of COVID-19 antibody tests had major shortcomings, a review concluded, offering further evidence the blood tests are of little use for people seeking to know with certainty if they have been infected.

The coronavirus pandemic is accelerating, with Thursday’s 150,000 new cases the highest in a single day and nearly half of those in the Americas, the World Health Organization (WHO) said.

Healthcare workers in Britain and Thailand started taking part in a trial to determine whether two anti-malarial drugs can prevent COVID-19, including one that U.S. President Donald Trump says he has been taking.

A top U.S. scientist said governments should not count on a successful vaccine against COVID-19 being developed anytime soon when deciding whether to ease restrictions imposed to curb the pandemic.

A key modeling study from Singapore has found that putting multiple social lockdowns in place – including school closures – will have the biggest impact on curbing COVID-19, the pandemic disease caused by the new coronavirus.

Asia reported hundreds of new coronavirus cases – including an American soldier stationed in South Korea – as the United States warned of a pandemic, the disease spread in Europe and Brazil confirmed Latin America’s first infection.