1. COVID-19 refers to novel coronavirus infection, coronavirus pneumonia refers to coronavirus pneumonia-19, and coronavirus pneumonia-19 refers to novel coronavirus.

Second, the English name infected by novel coronavirus was named coronavirus pneumonia-19 by the World Health Organization, and the virus will constantly adapt to the host and mutate during the replication process. After novel coronavirus invades the human body, it may multiply in the body and cause inflammatory reaction. Patients may have symptoms such as fever, dry cough, dry throat, sore throat and fatigue.

The English name of Omicron is Omicron, which is a variant of coronavirus pneumonia-19. The mutant may carry a large number of gene mutations, which is highly contagious and has less damage to lower respiratory tract and lung tissue, but the damage caused by it cannot be ignored.

Four, the World Health Organization defines Omicron mutant as the fifth "mutant of concern". Compared with other strains, Omicron mutant has stronger concealment and transmission ability, but the symptoms of infected people are relatively mild and not too serious. Clinical manifestations such as muscle aches, general weakness, cough, headache and hoarseness may occur after infection with Omicron variants.

5. In order to prevent Omicron mutant infection, when going out in daily life, you should take protective measures, wear a mask, wash your hands frequently, disinfect frequently, and often open the window for ventilation. If there is no special physical condition, vaccination in COVID-19 should be standardized.