WHO says ‘evidence emerging’ that coronavirus may be airborne “No one is suggesting COVID behaves anything like measles… That’s not the point (the scientists) are trying to make.”In an open letter to the WHO published Monday, scientists across 32 countries called for the organization to revise its safety recommendations to mitigate possible spread of COVID-19 through aerosols — tiny, light particles expelled when people cough, sneeze or breathe that stay suspended in the air for longer periods of time.The WHO currently classifies SARS-CoV-2 as a droplet virus, spreading through larger, heavier particles that can travel one to two metres before hitting the ground.