There is no exact time as to how many days after Omicron infection symptoms will appear, some people develop symptoms after about 3 days of infection and some people do not develop symptoms after infection and are asymptomatic infected people. The Omicron strain is a mutated strain of C. neoformans, and it has an incubation period of 2 to 3 days. Symptoms usually appear about 3 days after infection with the omicron strain, but this time varies from person to person. Patients infected with Omicron may experience fever, malaise, aching limbs, dry cough, and in some cases headache, shortness of breath, sore throat, and runny nose. The symptoms are usually mild and rarely severe after infection with the Omicron strain, but it is also highly transmissible and pathogenic, so it is important to be aware of the need for protection. It is important to note that asymptomatic infections are also contagious. Prevention of omicron infection is the same as the prevention of neocoronavirus infection, both of which should pay attention to personal protection, wash your hands frequently, wear a mask when you go out, don’t go to crowded places, and get vaccinated against neocoronavirus pneumonia in a timely manner. If symptoms such as fever, malaise, and dry cough occur, it is important to get a nucleic acid test to rule out the possibility of infection and to minimize contact with other people. If the diagnosis of omikujon virus infection is confirmed, it needs to be reported as soon as possible, isolated, and treated accordingly according to the symptoms of the patient. [Note: In this article, the terms “neocoronavirus pneumonia and novel coronavirus pneumonia” were renamed to “novel coronavirus infection” on December 26, 2022, as announced by the National Health Commission.