Since the beginning of the pandemic it has been a mystery why some people who are infected with the virus causing COVID-19 go on to develop severe complications while others get away with few mild symptoms and some others exhibit no symptoms at all. Experts have been trying to figure out how best to identify people who are at risk of severe disease and complications. They have so far zeroed in on a few predictors. Now experts say that a simple ultrasound of the lungs can also predict this. Lung ultrasound which is commonly used by doctors as a tool for