The Omicron variant is a mutated strain of the new coronavirus, which is categorized into asymptomatic, mild, and severe types, with symptoms varying in severity. 1. Asymptomatic: Usually there are no symptoms, but only abnormal laboratory test results. 2. Mild: Once infected, symptoms such as muscle aches, hoarse throat, fatigue, mild cough and headache may occur. 3. Severe: Dyspnea and hypoxemia occur, and in severe cases, acute respiratory distress syndrome, sepsis-induced shock, uncorrectable metabolic acidosis, and multiorgan failure may develop rapidly. If the symptoms of suspected new crown infection, it is recommended to improve the new crown nucleic acid test in a timely manner, and those who are diagnosed should cooperate with medical personnel to do a good job of isolation and treatment measures, according to their own conditions for standardized treatment.