Every time the news about the "rejuvenation" of nucleic acid testing for patients with new coronary pneumonia cured, it will stir the public's sensitive nerves.
In the past two days, Yu, a close contact of the "Fuyang" case of Beijing's new coronary pneumonia, caused concern. A few days ago, the female retired worker in Jingzhou, Hubei, was "fuyang" after healed for about half a year, and the news of "Fuyang" discovered by a man from Jilin when he was in Shanghai for medical treatment has repeatedly swept the screen.
Lin Jiangtao, director of the Department of Respiratory and Critical Care Medicine of the China-Japan Friendship Hospital, told the reporter of Science and Technology Daily that there are many misunderstandings about "Fuyang", and many topics about "Fuyang" are false propositions, "but trouble the people. , Easily cause panic". Lin Jiangtao said frankly, don't exaggerate the promotion of "Fuyang" for patients with new coronary pneumonia cured.
Wang Guiqiang, director of the Department of Infectious Diseases at Peking University First Hospital and a member of the National New Coronary Pneumonia Medical Treatment Expert Group, also mentioned in an interview with reporters that it is not appropriate to exaggerate "Fuyang". "For patients with new coronary pneumonia that have been cured for half a year, the nucleic acid test is'Fuyang', it is hard to talk about the specific situation. I think this requires scientific research to comment.
"Fuyang" is not terrible
Wang Guiqiang mentioned earlier that in my country's preliminary data, overall, the proportion of "fuyang" population is not particularly high. Zhong Nanshan, an academician of the Chinese Academy of Engineering and a respiratory expert, said that as long as the body has enough antibodies, generally these cured patients will not be infected again.
Zhong Nanshan believes that most of the so-called "fuyang" should be the detection of nucleic acid fragments rather than the virus itself. Generally speaking, nucleic acid fragments are not infectious. Some scholars have cultured the throat swabs and secretions of "fuyang" patients, but no live virus has been cultured.
"Fuyang" may be related to the long cycle of negative conversion, not a special case of new coronary pneumonia. Lin Jiangtao said that compared with the disappearance of clinical symptoms, many viral nucleic acid tests often take longer to turn negative. For example, after 3 months or half a year after the hand, foot and mouth disease is cured, a small number of children will be positive when the nucleic acid test is performed; the H1N1 influenza virus has also experienced similar situations.
In addition, "Fuyang" may involve the sensitivity of nucleic acid detection. Wang Guiqiang said that "Fuyang" may be due to the insufficient sensitivity of the test. For example, when the virus level and viral load are low, upper respiratory tract samples may not be found. When retesting, it is possible to find a virus. With the support of the Ministry of Science and Technology, research on improving the sensitivity of nucleic acid detection is continuously deepening.
Wang Guiqiang said that some patients, such as critically ill and critically ill elderly patients, have sustained positive or "rejuvenating" due to underlying diseases or weakened immune function.
Experts said that it is necessary to analyze specific issues in "Fuyang" and make rational discussions based on scientific argumentation.
Strategically despise and tactically value
Lin Jiangtao said in an interview that in the war between humans and viruses, if a person wins the battle, the virus in the body will be eliminated or killed, and the "corpse" of the virus and the remnants of the defeated will be left with a nucleic acid test. , But "corpses" and defeated soldiers will not have "combat effectiveness" and infectiousness, so don't talk about masculine discoloration.
Experts say that as long as the clinician accurately judges that the patient has recovered, they should not over-interpret the nucleic acid test results, and there is no need to panic due to the "rejuvenation" problem in nucleic acid testing. Zhong Nanshan once said that "Fuyang" patients are not contagious. Generally speaking, he is not too worried.
However, from the perspective of the overall situation of epidemic prevention, one cannot be careless about "Fuyang".
Regarding the clinical changes in "Fuyang" cases, most patients are asymptomatic, and only a few will have symptoms, and a very small number of people will show the progress of pneumonia on chest X-ray or CT. Wang Guiqiang emphasized that, in general, although there are not many cases of "rejuvenation" in patients with new coronary pneumonia cured, this should not be careless and close monitoring should be carried out. "For'Fuyang' cases, they need to be treated in isolation as they are infectious." Wang Guiqiang told a reporter from Science and Technology Daily.
The reality is indeed the case. Once a case of "Fuyang" is found, the subject will be immediately isolated, and close contacts will be included in the scope of testing and observation, and a network of high standards and strict requirements to maintain public life and health safety will be built.
Intern reporter Dai Xiaopei