Omicron viruses are most contagious on the 3rd to 6th day after the onset of symptoms, when the viral load is at its highest. Relevant studies have shown that after infection with omicron, the peak viral load occurs 3-6 days after the onset of symptoms. Omicron is a mutated strain of C. neoformans, with an incubation period of 2 to 3 days, after which clinical symptoms usually occur. When it is most contagious, it causes respiratory symptoms, especially coughing and sneezing, and is easily transmitted to others through droplets. Therefore, it is important to isolate and treat Omicron virus infection. Omicron has a certain degree of harm, need to actively accept treatment, to avoid affecting the health of the body. Tip: In this article, the terms “new coronavirus pneumonia and new coronavirus pneumonia” were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.