Rumor identification: No, sniffing onions does not prevent new coronavirus pneumonia. Rumor Analysis: 1. The pungent odor of onions comes from sulfide compounds such as propylene sulfide. In in vitro tests, propylene sulfide has demonstrated some antibacterial ability. But new coronavirus pneumonia is caused by a virus, which is completely different from bacteria. Even if sterilization is considered, it requires a sufficient amount of onion and contact with bacteria, and not just a few sniffing onions. 2, the new coronavirus is mainly droplet transmission, so to prevent the new coronavirus pneumonia, you need to minimize the number of people and closed places, must go out properly wear a mask. Also maintain good personal hygiene habits, use soap or hand sanitizer, and wash your hands with running water. In addition, exercise, regular rest and rest, and improving your immune system are the most important ways to avoid infection. Special Note: The main transmission routes of the new coronavirus have been confirmed: 1, respiratory droplet transmission, when the patient coughs, sneezes, speaks loudly, the droplets and exhaled gas are directly inhaled by susceptible persons at close range, then it can lead to infection. 2, contact transmission, droplets deposited on the surface of objects, contact and contaminated fingers, and then contact with the susceptible person’s oral cavity, nasal cavity, eyes and other mucous membranes, will also lead to the occurrence of infection.