Fresh studies give more information about what treatments do or don’t work for COVID-19, with high-quality methods that give reliable results. British researchers on Friday published their research on the only drug shown to improve survival — a cheap steroid called dexamethasone. Two other studies found that the malaria drug …

BRUSSELS — At the start of one of the most daunting and divisive summits in recent history, the atmosphere among the European Union leaders was downright giddy. Blame the coronavirus pandemic. With all kinds of masks, social distancing rules, and new ways of greetings, some of the leaders reveled in …

FORT LAUDERDALE, Fla. — Teams of military medics were deployed in Texas and California to help hospitals deluged by coronavirus patients, as Miami area authorities began stepping up enforcement Friday of a mask requirement — echoing efforts in many parts of the world to contain surging infections. In California, military …