Zhejiang Guobao Environmental Technology Co., Ltd. calls on everyone to travel cautiously and strengthen protection!

According to the Expert Consensus on Rapid Detection of novel coronavirus Antigen (2022) in China, because of the low sensitivity of antigen detection, it can be seen only when the amount of virus infection in the body reaches a certain level. In general, the test paper will show weak and strong positive results within 4-10 days after infection. The most obvious detection will take place on the sixth day. There are many COVID-19 in the body, and the two bars are the darkest. That is to say, in the early stages of being positive (1-3 days), there may be symptoms, but antigen testing is generally negative, which is very common. If you have symptoms or a history of contact with positive patients, you can try taking multiple tests or getting a nucleic acid test.

In the early stage, there may be symptoms such as small tongue flushing, tonsillitis, redness, hoarseness, thirst, drowsiness, and muscle soreness. Afterwards, common symptoms include intermittent fever, cough, sore throat, stuffy nose, headache, muscle pain, etc. According to the Beijing Daily, Li Dong, the chief physician of the General Infection Department of Beijing You'an Hospital and a medical expert of Xiaotangshan Fangcang Hospital, summarized a "symptom analysis" of the nucleic acid turning negative from the first day to the seventh day after ordinary young and middle-aged patients were infected with COVID-19.

Day 1: Symptoms are mild. May feel mild dry throat, sore throat, and physical fatigue.

The next day: Fever symptoms began to appear, with some young people experiencing a high fever of around 39 degrees Celsius. At the same time, the discomfort in the throat worsens.

Day 3: The day with the most severe symptoms. High fever above 39 degrees Celsius, body aches and weakness, and throat pain intensifies.

The fourth day: The peak of body temperature began to drop. Many people's body temperature drops to normal from this day and they no longer have a fever. But still the throat is sore and itchy. Some people begin to shed tears and cough.

Day 5: The body temperature basically drops to normal. But nasal congestion, runny nose, sore throat, cough, and physical fatigue still exist.

Day 6: No more fever. Symptoms such as cough and runny nose worsen. The early stage virus causes damage to the respiratory mucosa, and the human body excretes necrotic cells through runny nose and coughing. There may be a negative nucleic acid reaction.

Day 7: All symptoms begin to improve significantly. Nucleic acid is highly likely to turn negative.

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