What is going on when the nucleic acid test is positive but not contagious?
Pay attention to the new crown vaccination
◎Our reporter Zhang Jiaxing
"We have a way to distinguish whether the positive nucleic acid test is caused by infection or vaccine contamination." At a recent press conference of the Joint Prevention and Control Mechanism of the State Council, when answering a question from a reporter from Science and Technology Daily about the positive nucleic acid caused by the vaccine, China Disease Wang Huaqing, chief expert of the immunization program of the Control Center, said that ordinary people do not need to worry if they are tested positive for nucleic acid caused by the vaccine.
Why does vaccine contamination also show positive?
A few days ago, several returnees from Qianjiang, Hubei, tested weakly positive for nucleic acid.
After investigation, the reason was that the vaccine spilled during the new coronavirus vaccination.
Why does a vaccine spill make a nucleic acid test positive?
Wang Huaqing explained that the new crown inactivated vaccine is a vaccine prepared from a wild virus through processes such as cultivation and inactivation. Through inactivation, it has lost its pathogenicity and infectivity, but retains its genes.
Nucleic acid detection is the use of molecular biology detection methods to capture gene sequences consistent with the new coronavirus sequence.
Therefore, if the new crown vaccine is tested for nucleic acid, it will also show the possibility of weakly positive.
"During the vaccination process, including opening the vaccine ampoules, extracting the vaccine solution, and discharging the air before injection, there may be some vaccine pollution in the environment." Wang Huaqing said that the pollution may result in a positive nucleic acid test. But it is no longer contagious.
In order to avoid "false positives" caused by such negligence, the China Centers for Disease Control and Prevention previously issued a document requiring that in the process of vaccination in various places, one is to reduce the number of accompanying persons; the other is to follow the operating procedures during the vaccination process. Complete the vaccination; third, the vaccinators and accompanying persons must be screened during the vaccination process, and they must also wear masks in accordance with regulations.
"At the same time, the vaccination unit must do a good job in the standardized treatment of medical waste." Wang Huaqing explained that these methods can reduce the occurrence of vaccine contamination that may cause a positive nucleic acid test.
When does the minor vaccination start?
As of June 10, a total of 84.529 million doses of new coronavirus vaccines have been reported nationwide.
my country's new coronavirus vaccination is mainly carried out for people over 18 years old. When can minors between 3-17 years old start vaccination?
Cui Gang, the second-level inspector of the CDC of the National Health Commission, responded: In order to protect the health of the people, large-scale population vaccination has always adhered to the principle of prudent and prudent.
The formulation of vaccination policies requires comprehensive consideration of various factors such as the epidemic situation of infectious diseases, disease burden, and the effectiveness and safety of vaccines.
At present, the relevant state departments have approved the emergency use of the new coronavirus inactivated vaccine for people aged 3-17.
According to the situation of the epidemic situation, the needs of prevention and control work, and the characteristics of relevant populations, the National Health Commission organizes experts to study and formulate specific policies for vaccination for people aged 3-17, and work with relevant departments to organize and implement the vaccination work for children and adolescents.
According to reports, after obtaining conditional marketing approval for the two inactivated vaccines developed by the Beijing Institute of Sinopharm Zhongsheng and Beijing Kexing Zhongwei, they continued to carry out expanded clinical trials for people aged 3-17, and accumulated more data. These data are reported to the country in a timely manner, and after careful review and verification by experts, it fully proves that it is safe to use the inactivated new crown vaccine for people aged 3-17.
Shao Yiming, a researcher at the China Centers for Disease Control and a member of the Vaccine R&D Team of the Scientific Research Group, explained that the clinical trial results showed that the two vaccines have a very strong ability to induce antibodies.
Combined with the domestic epidemic situation and approved by the relevant state departments, the new crown vaccine of Sinopharm Beijing Institute and Beijing Kexing Zhongwei Co., Ltd. can be used for vaccination of people aged 3-17 if necessary.
When talking about the arrangement of the next step of vaccination work, Cui Gang introduced that the current vaccination work in various places is organized and implemented in accordance with the principles of exhaustive response, cascading advancement, highlighting key points, ensuring safety, and sequential advancement of various groups of people.
According to the characteristics of prevention and control work, two key points are highlighted: one is key areas; the other is key populations.
At present, my country's new crown vaccination work has maintained a steady, orderly and upward trend.
As of June 10, my country has received 845 million doses of the new crown vaccine, covering 622 million people. my country ranks first in the world in terms of doses and the number of people covered.
So, what is the next step?
On the basis of doing a good job in the current stage of inoculation of key areas and key populations, the next step will continue to carry out the inoculation of other populations to further increase the coverage of populations, so that more people can be effectively protected as soon as possible.