New crown is the abbreviation of new coronavirus pneumonia, and the chance of infection is relatively high for those who are in close contact with the new crown. There is no detailed medical information on how high the chance of infection is, but the chance of infection is related to the time of contact, the way of contact, whether or not protection is provided, and whether or not the person has been vaccinated, and other factors. 1. Contact time: the shorter the contact time with the diagnosed person, the lower the chance of being infected, but if there is a long period of close contact and improper protection, the possibility of being infected is much higher. 2. Mode of contact: Comparing the mode of contact such as eating or sleeping together with shaking hands or rubbing shoulders, the former has a much higher chance of being infected. 3. Whether protection: If personal protection measures are in place, such as wearing a good mask, disinfecting, wearing protective clothing, etc., the chances of being infected will be relatively reduced when coming into contact with a diagnosed person. 4. Whether vaccinated or not: After vaccination, the body will develop antibodies against the New Crown virus, so vaccinated people are much less likely to be infected than unvaccinated people. If you find that you have been in close contact with a person who has been diagnosed with New Crown, you need to report the case to your neighborhood or hospital in a timely manner, be quarantined, and have a nucleic acid test done on a regular basis. If the nucleic acid results are consistently negative within 14 days, it means that they are not infected and can be released from quarantine.