It is possible to test positive 2 to 7 days after contact with a confirmed case of New Crown, but it is not 100% likely that you will be infected. The likelihood of infection is relatively high if there is a history of close contact with a confirmed case of C. neoformans. However, there is a certain incubation period, and it can usually be detected 2 to 7 days after being infected. The incubation period is when the infection is already present but the nucleic acid test is negative and the infection is not detected for a short period of time. However, the probability of infection is not 100%, and some people who are close contacts may not be infected because they have completed the full course of vaccination or have relatively strong immunity. Ultimately, the results of nucleic acid tests should be used as the basis, and at the same time, timely reports should be made and measures such as centralized isolation should be taken. Tip: In this article, “new coronavirus pneumonia” and “new coronavirus pneumonia” were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.