Omicron is a mutated strain of the novel coronavirus, which is usually infectious until cured. Omicron has the characteristics of strong concealment, rapid transmission and short incubation period; after infection with this virus, there are usually more patients with mild illnesses, so it is easier to cause the spread of the disease; this virus belongs to the mutated strain of the new coronavirus, and after infection with any kind of the new coronavirus, there is a strong contagiousness, and this contagiousness needs to be disappeared after the disease has been cured. Infection with the new coronavirus will lead to a dry cough and fever, weakness, dyspnea and other symptoms; if the patient’s condition is more serious, it may even lead to pulmonary fibrosis, respiratory failure, etc., so the diagnosis of the new coronavirus pneumonia should be treated in a timely manner. After infection or contact with the new coronavirus, timely isolation should be carried out to avoid widespread infection, and consult a specialist for guidance if you feel unwell.