I'm not Zor, but I do remember reading that the virus can survive up to 72 hours on hard surfaces. Which means, if an infected person touched e.g. a door handle, the virus can be transferred to the hand of the next person who touches it. Hence, wash hands and don't touch your face to help prevent it from getting entry into your body.
Edit: Washing your hands only reduces the risk. To be sure, use hand sanitizer which kills the virus
Edit2: Door handle is just an example, think stuff like shopping trolleys, faucets, water taps, railings etc.