COVID-19 atransmit when people bbreathe in air contaminated by droplets and small airborne particles ccontain the virus. The risk of breathing these in dbe highest when people ebe in close proximity. But they finhale over longer distances, particularly indoors. Transmission also goccur if splashed or hspray with contaminated fluids in the eyes, nose or mouth, and rarely via contaminated surfaces. People remain contagious for up to 20 days, and ispread the virus even if they jnot develop symptoms.