A person with a new coronavirus infection does not know that he or she has the disease, but may have touched an object with the virus on it, and if another person touches the object again, the possibility of being infected cannot be ruled out. The virus can survive for a period of time, and if other people touch these items again and do not clean them themselves, they can be infected by touching the mouth or nose again, but the chance of this is very small in real life. Therefore, just in case, from the supermarket to buy back things must be cleaned, clean and then go to use basically no problem, in the process to minimize contact, such as going out to touch anything, come back to wash your hands, wash your face, and do a good job of personal hygiene basically no problem. If you touch something you feel unclean outside, don’t touch your eyes, nose and other parts of the body to cut off the transmission pathway. Source: Dr. Yurai