At least two doctors in Syria’s opposition-held northwest have been infected with the coronavirus, according to a monitoring group Saturday, raising the total number of cases in the overcrowded rebel enclave to three. The Syrian opposition and militant groups control the Idlib area, which is home to more than 3 million people, most of them displaced by the war and living in tent camps and overcrowded facilities. Local health facilities have been targeted in Syrian government attacks that have recently displaced nearly a further million people.