On February 22nd, 65438, the Infectious Diseases Forum was held in the Infection Center of Tsinghua University Chang Gung Hospital. Zhang Wenhong gave a speech on "Research Progress of Infection and Immunity". Zhang Wenhong said that the proportion of patients with symptoms in the north is much higher than that in the south, and the proportion of patients with symptoms in Shanghai is between Beijing and Guangzhou.
At present, COVID-19 infected in China are BA.5.2 and BF.7, both of which are subfamilies of the mutant strain BA.5 of Omicron. The northern and southern strains are not the same subtype, and the pathogenicity of the virus is also different, which means that the virus is still mutating.
At present, COVID-19 mutant strain BF.7 is mainly infected in Beijing, Hebei, Tianjin and other areas in northern China. The symptoms after infection are: high fever, cough for several days, general pain, dizziness, headache, sore throat, loss of sense of smell and taste, loss of appetite, vomiting, diarrhea and so on. In the southern part of Guangdong, the main infected COVID-19 mutant is BA.5 After being infected by this mutant, although some people have the above symptoms, the symptoms are much lighter than those in the north.
A few days ago, my son returned from Guangdong to Xinle, Shijiazhuang, Hebei Province, and dropped by his grandmother's house to see his grandmother. Later, because of the epidemic, my sister and I didn't go back to my mother for a long time. We also invited him back to our mother's house. Unexpectedly, the next day, when we came back, we all confessed and all were positive. When our son came back, he had no symptoms. We all think that it is impossible to infect COVID-19, only that it is a cold and fever. I have a sore throat, cough with excessive phlegm, general weakness and pain all over. After the phone call, all of them were tested with nucleic acid kit, and they didn't catch a cold. They are all COVID-19 positive, and the two red lines are obvious.
My son and I analyzed the COVID-19 infection. Why is the proportion of symptoms in the north much higher than that in the south?
1. There is no snow in the north this winter. The climate in the south is humid and the weather in the north is dry.
This winter, it never snowed in Shijiazhuang, north of China, and it was windy. It can be said that the weather in this winter is extremely dry, and the climate in Guangdong is also humid, because it is close to the sea, unlike our northern climate, which is particularly dry. In Guangdong, the skin is not as dry as in our home. My son told me that with humid air, people's respiratory diseases will be relatively mild, and this difference is obvious.
The temperature is high in the south and low in the north.
My son also told me that the temperature in the south is a few degrees above zero. He can wear a thin cotton-padded jacket for the winter, but when he gets home, he has to wear a sweater and a thicker cotton-padded jacket to avoid being very cold. Now it's MINUS 6 to 7 degrees in the north, and sometimes even MINUS 10 degrees. Cold can weaken respiratory mucosa, reduce people's immunity and make people vulnerable to virus infection. It's very cold.
Summary: My son told me that his friend in Guangdong bought cold medicine, even Huaqingwen capsules, but now in China, even conventional medicines such as Radix Isatidis, cough syrup and Lianhua Qingwen capsules are hard to buy, which shows that the symptoms in the north are much higher than those in the south. At the same time, my sister also called me to tell me that it is very expensive to buy cold medicine, and some common cold medicine can't be bought.