The clinical symptoms of patients infected with the new coronavirus do not differ significantly from those of previous infection with the novel coronavirus, with fever, fatigue, and cough being the main symptoms. Some patients infected with delta virus first show loss of taste and smell, and in milder cases the symptoms are diminished. A small percentage of patients have cold symptoms, such as nasal congestion, runny nose, sore throat, conjunctivitis in the eyes, mild muscle aches and pains, and diarrhea. About a week after the onset of infection, patients with severe disease may develop respiratory distress, hypoxemia, and in severe cases, acute respiratory distress syndrome, septic shock, and even systemic multi-organ failure. However, unlike previous new crown strains, delta virus has significantly increased its ability to spread, it has nearly doubled its ability to spread, and the incubation period or transmission interval has shortened, and the speed of transmission is accelerating. Therefore, prevention is the key, and daily personal protection should be done to avoid contact with patients or subclassified groups of people, and do not go out to high-risk areas. If you feel sore throat and other discomfort, you should seek medical attention, cooperate with nucleic acid testing, and do self-isolation.