New Coronavirus delta is also known as New Coronavirus delta variant in clinical practice. It has atypical clinical features, and infected patients may generally show only mild muscle pain, smell disturbance, malaise and other discomforts in the early stage, and for a few patients there may be fever, sore throat, diarrhea, runny nose, drowsiness, conjunctivitis, etc. There are also some infected patients without obvious clinical symptoms. Delta virus has certain differences from the previous new coronavirus, which is very infectious and can reach 5 generations within 10 days in the early stage of transmission, with a significant increase in viral load. After the onset of the patient, the average incubation period is 4.4 days, while the disease progresses relatively quickly, with a high number of patients turning into heavy and critical types, and their treatment time is relatively long. Therefore, care should be taken to wear a mask when going out, take temperature frequently, wash hands regularly, and do a good job of personal protection, especially if you are in an area with medium to high risk of developing the disease. For patients with the above symptoms, it is recommended to go to the hospital for disease screening through serological testing and nucleic acid testing, and if the infection of Delta virus is confirmed, they should seek medical attention for isolation and professional treatment.