#A case of infected person in Shanghai tested negative for 5 days in 7 days#
At 5:00 pm on July 26, Shanghai Municipal Government News Office organized the 229th press conference on the prevention and control of the new coronavirus pneumonia in Shanghai.
Baoshan District reported 1 socially-found positive infection case, the newly added positive infection, male, 38 years old. 7 days ago, he had nucleic acid tests for 5 times, and all of them were negative . Later, abnormal nucleic acid testing was found during community screening. After review by the disease control department, it was positive and was diagnosed as an asymptomatic infected person with . He was transferred to , a designated medical institution for for isolation and medical observation.
Multiple nucleic acid tests "yin to yang" are not an isolated case . From 2020 to 2022, many places have reported cases of "yin to yang". So why is this happening?
nucleic acid "yin to yang" is mainly because the virus colonization period is extremely detoxified. At this time, sample collection can easily lead to the occurrence of "false negative".
So what does "colonization" mean?
When pathogenic microorganism invades the host and causes pathological changes, we call it "infection". When various microorganisms , such as viruses, bacteria, etc., are adsorbed by the human body from different environments, temporarily settle and continue to grow and reproduce offspring in certain places, but have not yet caused to infect , this phenomenon is usually called "colonization" .
virus life cycle can be divided into several main stages:
invasion and colonization → adsorption → injecting cells → replication and proliferation → release and attack
Deputy Director of the Chinese Center for Disease Control and Prevention Feng Zijian said in an interview with CCTV reporters: Infected people or patients from being exposed to infection to starting to detoxify, professionally called the "strong hidden phase", while asymptomatic infected people are called the "pre-hidden phase", and can also be called the window period for laboratory testing and screening (referring to the period from the time when the virus is infected to the detection of the corresponding antibodies).
In this case, is it necessary to perform nucleic acid testing?
of course is necessary! Judging from the development laws of clinical diseases, the incubation period of the new coronavirus in the human body is 1 to 14 days, most of which are 3 to 4 days, and the infectiousness is very strong 1 to 2 days before symptoms appear and the early stage of onset. Therefore, asymptomatic infections are also contagious.
Therefore: the original intention of normalized nucleic acid testing is to actively discover people in during the colonization period of viruses, detect and isolate as soon as possible, and block the transmission pathway as soon as possible.
The above cases tell us that we must take the initiative to be healthy, actively prevent the epidemic, and improve personal awareness of prevention and control.
Any scene and time is possible during the exposure of the virus.
How to minimize the risk of individual infection as much as possible in unconscious exposure scenarios?
First of all, we must do: "three-piece set" of epidemic prevention, and "five" protection .
"Three-piece set": insist on wearing masks, maintaining a one-meter social distance, and paying attention to personal hygiene;
"Five" : Keep taking masks, keeping social distance, covering coughs and sneezes, washing hands frequently, and opening windows as much as possible.
In addition, if we are accidentally exposed to the viral environment: medical staff, nucleic acid sampling volunteers, close contacts or secondary close contacts and other medium- and high-risk groups, we should scientifically and rationally: seize the virus window period, remove virus colonization, and curb virus infection.
Oral and nasal mucosa is the main way for viruses to invade the human body. It is very important to colonize the oral and nasal mucosa! ! !
27 authoritative experts latest research consensus : nasal saline rinsing can be used as a means to prevent new coronavirus infection
Xinmin.com, Toutiao, NetEase, Tencent, Sohu, Interface News and dozens of mainstream media reports
Hans Third People's Hospital, Director of Shenzhen Third People's Hospital, said, "The nasal cavity is our first line of defense. maintains the health of nasal function and is an important protective measure during the epidemic period, which can effectively prevent infection and accelerate recovery after infection. Currently, studies have shown that by taking preventive or therapeutic interventions in nasopharyngeal early, viral load can be reduced, disease course can be shortened, and transmission in family contacts can be reduced.
Chinese Center for Disease Control and Prevention Epidemiology Chief Scientist Professor Zeng Guang also said: For our personal epidemic prevention, in addition to the "three old things", wearing masks, washing hands frequently, and gathering less, we must also open windows frequently for ventilation. In addition to wearing masks in areas with severe epidemics, also needs to rinse your mouth frequently.
0 The epidemic situation in various places is repeated. We must always remember to wear a mask, maintain a safe social distance, pay attention to personal hygiene and de-colonization of the oral and nasal mucosa, build an immune barrier, and resolutely and decisively block the spread and spread.
Take good personal protection, strictly implement the "three-piece set, five-first" and get the new crown vaccine as soon as possible, be the first person responsible for your health, and resolutely defend the hard-won prevention and control results.
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