Henan launched a covid-19 vaccine to strengthen immunization in an orderly manner

For the masses who have not yet received the new crown pneumonia reinforcing injection, in the future, when the reinforcing injection is given, there is a new way of playing: both homologous vaccination and heterologous vaccination can be selected, that is, sequential enhancement of immunization.

It is understood that according to the requirements of the national plan and the vaccine group of the provincial epidemic prevention and control headquarters, Henan will carry out sequential strengthening of immunization on the basis of homology strengthening, ensure that the target vaccination targets "should be fully connected", and establish a herd immunity barrier in the province.

What is Sequential Booster Immunization? Who needs to fight? Let's take a look at the expert interpretation.

What is Sequential Booster Immunization?

According to disease control experts, sequential enhancement of immunization is heterologous enhancement of immunization, which refers to the selection of a new crown vaccine with different technical routes from before when strengthening immunization. For example, if the previous vaccination was an inactivated vaccine, if the booster needle chooses an inactivated vaccine, it is homologous strengthening, and if the new crown vaccine is selected with a non-inactivated process, it is called sequential enhancement immunization.

At present, there are three types of COVID-19 vaccines in mainland China: inactivated vaccines, adenovirus vector vaccines and recombinant protein vaccines.

Inactivated seedlings are the first production of live viruses, through physical or chemical methods, the virus inactivated into vaccine immunity; adenovirus vector vaccine is the most effective viral antigen gene inserted into the adenovirus genome, infected by adenovirus human cells, the gene is introduced into human cells, human cells express antigens, stimulate the body's immune response. The recombinant protein vaccine is to express the most effective antigen component in vitro through genetic engineering in vitro cells, and the cell is a cell that is often used in biological products, and this cell produces this protein through a way similar to industrial fermentation, that is, a bioreactor, and finally makes a vaccine.

Why sequential immunization?

Previously, the mainland has been implementing a homologous booster immunization strategy, which means that the booster needle must choose the same technical route of the new crown vaccine for vaccination. Now it can be sequentially strengthened immune, why?

Shao Yiming, a member of the vaccine research and development expert group of the scientific research group of the joint prevention and control mechanism of the State Council, said that according to the previous experience in the prevention and control of infectious diseases, a single vaccine can deal with conventional viruses, but for the cunning viruses that are good at mutation, different vaccines can be implemented "joint operations".

"Sequential immunity has two advantages." Shao Yiming explained: First, different vaccines can complement each other's advantages, and the other is that for some people, side reactions can be reduced, due to different human physiques, people who may have side reactions to a certain vaccine are heavier, and they can be transformed by vaccines to reduce the occurrence of side reactions.

Wu Liangyou, deputy director of the Disease Control Bureau of the National Health commission, said that the current Aomi Kerong variant has become the dominant strain of imported and local epidemics outside the mainland, its transmission is stronger, the transmission speed is faster, and the risk of overseas imported epidemics and local epidemics in the mainland has increased significantly.

In response to the coronavirus mutation, the World Health Organization supports flexible homologous vaccines and heterologous vaccination programmes. Wang Huaqing, chief expert of the immunization program of the Chinese Center for Disease Control and Prevention, said that based on the research evidence, some countries in the Americas, Europe and Southeast Asia have begun to implement a sequential strengthening of immunization.

"The research data shows that homologous enhanced immunization and sequential enhanced immunization can further improve the immunization effect, and people who hope to meet the vaccination conditions can take the initiative to vaccinate and vaccinate early." Wu Liangyou said.

Who can choose sequential immunity?

Wang Huaqing, chief expert of the immunization program of the Chinese Center for Disease Control and Prevention, said that there are 3 conditions for the object of sequential immunization this time

One is people over the age of 18;

The second is to complete 2 doses of inactivated vaccination according to the procedure, and the vaccine is one of the three inactivated vaccines of the new crown virus in china medicine beijing company, beijing kexing company, and sinopharm wuhan company;

Third, there is no booster immunization, that is, the third injection is not given.

It is reported that the vaccine that can be selected for the sequential enhancement of immunization in Henan is the recombinant protein vaccine of Anhui Zhifeilong Kema Co., Ltd. or the adenovirus vector vaccine of Tianjin Cansino Company, and the implementation of 1 dose of sequential enhanced immunization is implemented.

"This group of people can choose sequential immunization, or they can choose the original technical route vaccine for homologous booster immunization." Wang Heng, head of the immunization planning section of the Center for Disease Control and Prevention of Zhengzhou's Erqi District, said that at present, 23 outpatient clinics in the district have been trained, and sequential immunization enhancement can be carried out tomorrow.

It is also understood that at present, Jiaozuo City has taken the lead in launching a sequential strengthening of immunization.

What happens if someone has a fever after getting the vaccine?

At present, the epidemic prevention and control situation at home and abroad is severe and complex, and the Henan Provincial Center for Disease Control and Prevention reminds everyone to continue to maintain a high degree of protection awareness, adhere to scientific wearing of masks, wash hands frequently, ventilate frequently, do not gather, maintain safe social distance, develop good hygiene habits, and do not travel to medium- and high-risk areas if it is not necessary. At the same time, it is necessary to vaccinate the new crown virus vaccine as soon as possible, and actively vaccinate the reinforcing needle after 6 months to avoid the risk of infection as much as possible.

Some people ask, after the vaccine, why do people have adverse reactions such as fever?

"After vaccination, as a biological product, it may itself cause fever, rash, induration, etc., which is a property of biological products and shows that the immune system is responding to vaccines." Wang Heng said that this is a normal phenomenon, generally one to two days on its own will alleviate, do not panic particularly. After vaccination, it is necessary to stay for 30 minutes, and when there is an adverse reaction suspected of being related to vaccination, if the duration is longer and the symptoms are more serious, one is to report to the vaccination unit, and the other is to seek medical treatment in time.

Source: Henan Daily Reporter: Li Xiaomin Copyright belongs to the original author, if there is infringement, please contact to delete

Editor-in-charge: Wang Shiyang Review: Lou Heng