Germany has boosted its coronavirus test rate to 500,000 a week, a virologist said Thursday, adding that early detection has been key in keeping the country’s death rate relatively low. “The reason why Germany has so few deaths compared to the number of infected people can be explained by the fact that we carry out an extremely large number of laboratory diagnostic tests,” said Christian Drosten, who heads the Institute of Virology at Berlin’s Charite University Hospital. “Estimates from the last days show that we are carrying out half a million...