The average incubation period of the new coronavirus “Delta” strain is 4.4 days, which is shorter than the incubation period of 5.2 days of the previously identified general virus. Transmission occurs before the onset of symptoms and is faster and more insidious. After infection with the Delta strain, the early stage is mostly characterized by fever, dry cough, and malaise. Some patients have the first symptoms such as decreased or lost sense of smell and taste, and a few patients have symptoms such as nasal congestion, runny nose, sore throat, conjunctivitis, myalgia, and diarrhea. Some patients may present with abdominal distension, abdominal pain, and drowsiness. Currently, for the common type of patients, treatment with prone ventilation is a more effective measure, while for the treatment of heavy cases, the use of recovery plasma as well as comprehensive antibody therapy is effective. In addition, prevention of delta virus is very important, the public should actively vaccinate with the new crown vaccine, wear masks properly in public; try to cover the mouth and nose with tissues or clothing when sneezing; keep a certain social distance from others, do not gather or party, do not go to or minimize going to crowded places; should pay attention to the announced medium and high risk areas every day, avoid going there, and try not to go out during special periods; if you have contact with the infected If you come into contact with an infected person or go to the place where the case occurred, you should seek medical examination in time to avoid delaying the disease.