Where did you get 200 nonometers (nanometers)?
Current evidence suggests that COVID-19 spreads between people through direct, indirect (through contaminated objects or surfaces), or close contact with infected people via mouth and nose secretions. These include saliva, respiratory secretions or secretion droplets. These are released from the mouth or nose when an infected person coughs, sneezes, speaks or sings, for example. People who are in close contact (within 1 metre) with an infected person can catch COVID-19 when those infectious droplets get into their mouth, nose or eyes.
To avoid contact with these droplets, it is important to stay at least 1 metre away from others, clean hands frequently, and cover the mouth with a tissue or bent elbow when sneezing or coughing. When physical distancing (standing one metre or more away) is not possible, wearing a fabric mask is an important measure to protect others. Cleaning hands frequently is also critical.
