Delta virus is a mutated strain of New Coronavirus. Most patients have symptoms similar to those of New Coronavirus-infected patients after infection, and some patients are asymptomatic infections and may have no obvious symptoms in the early stage. Some patients may also exhibit respiratory symptoms such as cough, sore throat, nasal congestion and runny nose, as well as fever, malaise, drowsiness, abdominal pain, diarrhea, muscle aches, olfactory disturbance, conjunctivitis, etc. The disease progresses rapidly and varies from patient to patient. Delta virus has a high load and spreads quickly, and is more contagious and has a shorter incubation period than the new coronavirus. The disease progresses rapidly after infection and can develop into a serious illness in 3-4 days. If the above symptoms appear, you should seek medical attention and isolation treatment in time to avoid the progression of the disease, prolonging the treatment time and increasing the difficulty of treatment. In addition, health conditions should try to vaccinate the new crown vaccine, which helps to increase the body’s resistance to the virus. Do virus protection measures in daily life, wash hands and disinfect regularly, and wear masks correctly. Do not go to crowded places, keep a safe social distance of 1 meter, avoid going to work or school with illness, and ventilate your home and office frequently. It is recommended that clothing worn when going out and in contact with the outside world should be hung separately after returning home, and disinfected if possible. The above measures can help reduce the chance of infection.