You generally cannot get infected with the new coronavirus if you open a window and ventilate the room, unless a positive patient coughs or sneezes in front of the window and brings the virus inside. New coronaviruses trigger new infections mainly through droplet transmission and contact transmission. Details are described below. 1. Infected patients spread the virus directly through sneezing, coughing, droplets, exhaled gases, etc. in close proximity, leading to infections in healthy people, so new infections can only be caused if a confirmed patient stands in front of a window and sneezes, coughs, etc. inwards. 2. Droplets containing novel coronaviruses are deposited on surfaces and are not inactivated, leading to infection in healthy people through contact. Therefore, it is recommended to open windows and ventilate the air during the outbreak.