Come, the previous science science class about Omikon BA.5 strains!

In recent days, Omikon BA.5 strains have appeared in many places in China, and the situation of preventing and control is severe and complicated. What are the characteristics of Omikon BA.5 strains? Is the disease higher? Today, Lei Jianhua, chief physician of the Infectious Department of Hunan University of Hunan Health and Health Committee Health Education and Propaganda Center, answered you.

Lei Jianhua pointed out that in the process of changing the development of new crown pneumonia, the new crown virus will continue to mutate, which is the basic law of biology. In the process of the interaction between the virus and the human immune system, in the context of various new therapeutic drugs and vaccine promotion, some new advantageous pop strains will be gradually selected. At present, Omikon strains have become the main epidemic strains of multiple epidemics, and the newly separated Omikon BA.5 Asian branch strains, because BA.1, BA.2 and other Asian branch viruses It is more spread and deserves attention. Omikon BA.5 Asian branches have become the main popular strains in South Africa, Portugal and other countries. Beijing, Tianjin, Shaanxi and other places in my country have also reported that the local epidemic caused by the BA.5 Asian branch poison input cases.

Apegly -borne protein 452, 486 and other sites such as Omikon BA.5 sub -sub -sub -sub -sub -sub -sub -branch poison have undergone unique mutations, which enhances the combination of viruses and host cells, and the specific specificity of existing vaccines or past infections or past infections or past infections induced The antibody shows a certain degree of immune escape characteristics, reducing the protection of vaccination, making the sub -branch strain more infectious and shorter after infection.

According to Lei Jianhua, the R0 value refers to the dissection of the virus of other people without the intervention of public health measures and no immunity. It is reported that the R0 value of the BA.5 sub -branch strain reaches 18, while the R0 value of the primitive strain of the new crown virus is about 3.3, the R0 value of the Delta strain is about 5.1, and the R0 of Omikdon BA.1 Asian branch poison strains The value is about 9.5, and the R0 value of Omikon BA.2 Asian branch is about 13.3. Therefore, the infectiousness of the BA.5 Asian branch poison strains is much higher than that of other strains.

It should be noted that in the case of multiple rounds of epidemic and a high vaccination rate, the R0 value cannot reflect the actual appeal of the virus. From the current data analysis, compared with other Asian branches of Omikon, the pathogenic force of BA.5 Asian branch has not significantly increased and weakened, and severe cases are more common in those with basic diseases or elderly infections. This part of the infected person should give more active observation and treatment.

The prevention and control practice of several recent BA.5 sub -split strain epidemic indicates that existing prevention and control measures are still valid. The BA.5 sub -split strain still belongs to Omikon mutant strains, and its propagation method is still mainly droplet transmission and contact dissemination. The most important way to prevent and control is to block the transmission pathway and protect the susceptible. Wearing masks, hand hygiene and other protection, maintaining social distance, vaccination of new coronary virus vaccines, etc., advocate people to actively implement public prevention and control measures such as regular nucleic acid testing and active scanning codes.

In short, the epidemic situation that may cause the Omikon mutant BA.5 Asian branch, because there is a high virus infectious and immune escape, it needs to be paid more attention to it. Prevention and control measures are still effective, so you don't have to panic. (Hunan Daily All -Media reporter Zhou Yangle Correspondent Li Hefeng He Weijia)

[Responsible editor: Wang Yaobing Intern: Yang Shuwen]

[Source: Hunan Daily · New Hunan Client]

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