Chinanews.com, Beijing, July 31 (Ma Shuaisha) China's State Council Joint Prevention and Control Mechanism held a press conference on the 31st to introduce the situation of epidemic prevention and control and new crown virus vaccination, whether this round of epidemic will affect travel and how to respond to Delta Viruses, new coronavirus vaccination and other issues respond to outside concerns.
——The epidemic spreads in many places, can I travel?
He Qinghua, the first-level inspector of the CDC of the National Health and Medical Commission, pointed out that the Nanjing epidemic has three characteristics. First, the epidemic was triggered by the import of a delta mutant strain, with high viral load, strong transmission capacity, fast transmission speed, and long time to turn negative. Second, the time is relatively special. It is during the summer vacation when people gather in tourist resorts. Third, the place where it occurs is an international airport with dense population and relatively large circulation.
"Because of these three characteristics, the epidemic has spread to other cities in Jiangsu Province or outside the province, and there is still a risk of continuing to spread to other regions in the short term."
As of now, a total of 328 new local confirmed cases have been reported across the country this month, which is close to the total of the previous five months. 14 provinces have reported new local confirmed cases or asymptomatic infections.
Feng Zijian, a researcher at the Chinese Center for Disease Control and Prevention, pointed out that personnel in high-risk areas of the epidemic should cancel their outings; personnel from other areas should carefully check the epidemic risk status of their destinations before traveling, and temporarily postpone travel in high- and medium-risk areas; and take personal precautions , Including wearing masks, washing hands frequently, avoiding and reducing to crowded places indoors, and keeping proper interpersonal distance during outdoor activities.
"Elderly people, patients with chronic diseases, especially those who have not completed the full course of vaccinations for the new crown vaccine or those who have not yet been vaccinated for 14 days, and patients with chronic diseases, try not to travel abroad." Feng Zijian said.
——In the face of Delta virus, are the previous prevention and control measures effective?
After the outbreak of the Nanjing epidemic, in the face of mutated strains, people are more concerned about whether the existing prevention and control measures and the new crown vaccine are still effective.
"At present, our prevention and control measures are still effective." He Qinghua said that this conclusion is based on two basic understandings. The first is based on the scientific community's understanding of the new coronavirus.
It is still a coronavirus, and its source of infection and transmission route are basically clear.
The second is based on China's current prevention and control practices.
The current prevention and control measures have dealt with more than 30 epidemics in Guangdong, Liaoning, and Yunnan, with remarkable results.
Feng Zijian also pointed out that the mode of transmission of delta virus has not changed, and it is still spread mainly through respiratory droplets, contact with pollutants, and aerosol transmission. The previous prevention and control measures are still effective, but the transmission capacity of delta virus has increased significantly. , The implementation of prevention and control measures, including personal preventive measures and epidemic prevention and control measures, must be more stringent.
——Why can I get infected after being vaccinated? Do I need a booster shot?
Shao Yiming, a researcher at the Chinese Center for Disease Control and Prevention and a member of the Vaccine Research and Development Team of the Scientific Research Group, said that being infected after a vaccine is called a breakthrough case. It is a normal state, and it is not an exception.
Clinical data shows that no vaccine can prevent infection 100%, but in general, various variants are still within the controllable range of existing vaccines.
"China Kexing Vaccine has a protection rate of more than 65% for all symptoms and mild cases, and the protection rates for preventing severe cases, entering the ICU and death cases are as high as 87.5%, 90.3% and 86.3%, respectively." Shao Yiming said, this is sufficient. It shows that the Chinese vaccine can effectively reduce hospitalization, severe illness and mortality.
Regarding the validity period of antibodies after vaccination, Shao Yiming pointed out that the decline in antibody levels does not mean that the protection of the vaccine does not exist. The degree of protection to which the antibody level drops will disappear, and it is still being studied.
In addition to antibodies, the memory cells of the vaccinated population can also provide very important immune protection.
"At present, it seems that after all vaccines are vaccinated, the antibody level will decline over time, but the immune memory still exists." Shao Yiming said that all countries are studying booster immunization, and there is not enough evidence to show that it is necessary to treat the entire population. Give the third dose of vaccination.
Shao Yiming pointed out that preliminary observations show that there is no need for booster vaccination for the general population who has completed immunization within one year.
However, for the elderly who have completed the immunization for more than 6-12 months and have weak immune function and patients with underlying diseases, as well as those who have to work in high-risk areas due to work needs, and those who are engaged in high-exposure-risk occupations in China, Whether it is necessary to carry out booster injections and when to carry out booster injections is being studied.
——Can the vaccine be mixed? How long does the vaccination interval take?
Wang Huaqing, chief expert of the Chinese Center for Disease Control and Prevention’s immunization program, said that vaccines of different technical routes cannot be mixed. If the vaccination of the same variety of vaccine is completed, then the follow-up vaccine of the same technical route will be used to complete the vaccination.
Regarding the vaccination interval, Wang Huaqing pointed out that according to the new coronavirus vaccination technical guidelines, the vaccination interval between 2 doses of inactivated vaccine should be greater than or equal to 3 weeks, and the second dose should be completed as soon as possible within 8 weeks. In case of special circumstances, it cannot be timely. For vaccination, as long as the subsequent replanting completes the corresponding doses.
"Recent foreign studies have found that if the separation distance is appropriately extended, the immune effect may be better." Wang Huaqing said that there is a problem. If the entire vaccination is not completed in time, once an outbreak occurs, the protective effect of the vaccine may decrease and increase. Risk of infection.
Therefore, in accordance with the prescribed time interval, try to complete the vaccination within the required time range.
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