Infection with the new crown variant strain of Omicron may be asymptomatic or may present with generalized symptoms of upper respiratory tract infection, and a very small number of patients may present with critical symptoms. 1. Evidence suggests that the Omicron strain is more transmissible than the Delta strain, but with reduced pathogenicity. Most patients are predominantly asymptomatic, and the diagnosis is often confirmed by antigen and nucleic acid testing. 2. In some populations, symptoms are similar to those of a common upper respiratory tract infection, such as fever, dry cough, and malaise, and may be accompanied by symptoms such as loss of smell and taste, muscle pain, and diarrhea. 3. For the elderly or people with chronic underlying diseases, there is a small chance of severe infections, such as respiratory distress, decreased blood pressure, coagulation abnormalities and other critical symptoms. If there is a history of close contact or history of travelling in the epidemic, the person should report to the relevant authorities in a timely manner and be isolated and treated in a specialized institution to avoid the spread of the virus and the development of the disease.