Delta is a mutant strain of the novel coronavirus, called the Delta variant. This mutant strain is more adapted to the human body, has a high viral load, is highly transmissible, spreads rapidly, and can also lead to varying degrees of decreased vaccine protective efficacy. However, the clinical symptoms of infection with the Delta mutant strain are not typical, so it is not possible to accurately state the presence of the eight symptoms. Early symptoms in patients infected with the Delta mutant strain may only be mild, such as malaise and muscle aches. Some patients may have flu-like symptoms such as headache, sore throat and runny nose, and may also have impaired sense of smell or taste, red eyes, diarrhea and abdominal pain, usually with mild symptoms. However, in severe cases, the onset of the disease may be acute, and respiratory distress may occur, leading to hypoxemia due to low oxygen levels throughout the body, which can cause severe systemic organ failure. In addition, active vaccination with the new crown vaccine is still required, and personal protective measures need to be taken after completion of vaccination. You need to pay close attention to your own and your family’s physical condition. If you have suspicious symptoms such as fever, dry cough, fatigue, muscle aches, loss of smell and taste, nasal congestion, runny nose, sore throat, etc., it is recommended to go to the nearby fever clinic for examination. Avoid taking public transportation during the trip to the hospital, and you need to wear a more protective mask, such as an N95 mask, while keeping a safe distance of more than 1 meter from others.