coronavirus is spread in the air except for certain risky medical procedures, such as when patients are first put on breathing machines.In a change to its previous thinking, WHO noted on Thursday that studies evaluating COVID-19 outbreaks in restaurants, choir practices and fitness classes suggested the virus might have been spread in the air.Airborne spread "particularly in specific indoor locations, such as crowded and inadequately ventilated spaces over a prolonged period of time with infected persons cannot be ruled out," WHO said.Still, officials also pointed out that other modes of transmission — like contaminated surfaces or close contacts between people in such indoor environments — might also have explained the disease's.