At present, many places have entered the normal operation of nucleic acid detection.
Some rumors such as nucleic acid sampling swabs causing cancer have been circulating on the Internet, and even some elderly people are reluctant to undergo nucleic acid testing. What is the truth? Top News Henan Business Daily reporter invited experts from the Zhengzhou Center for Disease Control and Prevention to clarify their doubts.
Top News·Henan Commercial Daily reporter Li Jiaxiong Zhuotian
< strong>Can nucleic acid sampling throat swabs cause cancer? fake!
During nucleic acid testing, the “big whites” will take samples through swabs, which is what we often call “cotton swabs”.
After sampling, the swab will be put into the sampling tube.
Recently, nucleic acid sampling throat swabs circulating on the Internet can cause cancer, as shown below:
Actually, this statement is untenable.
A sampling swab looks like a cotton swab, but it is not a cotton swab. Zhou Peng, the technical director of the Microbiological Inspection Institute of the Zhengzhou Center for Disease Control and Prevention, said, “From the material point of view, the nucleic acid sampling swab consists of a swab head and a swab rod. The main materials of the swab head are polypropylene fibers and nylon fibers. The main material of the swab rod is ABS material, which will not cause harm to the human body.”
It is reported that the sampling swab is made of ABS material. The flocking method of spraying and electrostatic charging causes millions of nylon microfibers to attach vertically and evenly to the shank end. In fact, the bristles of the toothbrush we use every day are nylon, and the sampling swab is covered with millions of tiny fibers vertically and evenly. When sampling, just like brushing your teeth with a toothbrush, you brush the posterior pharyngeal wall of the mouth to take cells, and then put the sampling swab into the sampling tube. “Because nylon and polyester are used, it is easy to remove them into the preservation solution, and the laboratory will carry out related tests later.” Zhou Peng introduced.
Sampling swabs do not contain any soaking reagents
< p>In addition, Zhou Peng told a reporter from Top News Henan Commercial Daily that the sampling swab is produced for sampling and does not contain any soaking reagents, nor does it need to contain reagents, it is only used to scrape cells and Virus samples are placed in virus-inactivated preservation solution for nucleic acid detection.
Fluorescent probes will be used in the new coronavirus nucleic acid detection box using the “fluorescent PCR method”, but only in the sample detection process. Fluorescent probes are not used at all in the sampling process, so it is nonsense to say that nucleic acid sampling swabs are fluorescent probes!
Sampling swabs will be sent to third-party institutions for intradermal tests, skin sensitivity tests, etc. After that, it will be circulated to the market. “As a staff member of the new crown positive re-examination laboratory in Zhengzhou, since the outbreak of the epidemic, we have done a nucleic acid test every day, and the sampling swabs used are the same as everyone else, so everyone can be assured of safety.” Zhou Peng said.
As for why some people have mild sore throat, nausea and other symptoms during sampling or after testing, this may be due to individual differences, For example, the pharynx is more sensitive, which has nothing to do with the sampling swab itself.
Why “mixed mining” but not “mixed inspection”?
The discussion in the past two days has been quite lively. It is about why it is possible to “mix mining” but not “mixed inspection”?
In this regard, Zhou Peng also made relevant explanations.
He introduced that “mixed mining” is certified by relevant national documents to meet the needs of large-scale screening.
The “mixed test” has not been scientifically demonstrated, nor is it supported by relevant national documents, which may lead to biased results and even false negatives. The presence.
To give a simple example, the ratio containing the virus sampling solution is made into sugar water, and the ratio without virus sampling solution is made into plain water. The test is to draw the material directly from the sugar water. If a mixed test is performed, the boiled water and sugar water are evenly mixed before the material is drawn, which will reduce the sweetness, that is, the reduction of the virus content, which may cause the phenomenon of missed tests. Therefore, “mixed mining” is possible, but Can’t “mix up”!