COVID-19 is caused by a coronavirus called SARS-CoV-2. Older adults and people who have severe underlying medical conditions like heart or lung disease or diabetes seem to be at higher risk for developing more serious complications from COVID-19 illness. Although we are finding out here in America just how many different types of people can be affected and how badly it affects them. This mask is mostly for people in the United States, as the virus is running rampant across that country, due to the ineffectual leadership in the White house . make sure to try this on before you buy.