Friends who follow the epidemic will find that many positive COVID-19 infections reported now are asymptomatic infections of . So, do you know what is an asymptomatic infection? Are they still contagious? Let’s listen to the expert’s answers.
Image source: Fujian Disease Control
What is an asymptomatic infection?
asymptomatic infection refers to the nucleic acid test for , but there are currently no symptoms and signs that can be self-perceived or clinically identifiable, such as fever, dry cough, fatigue, sore throat, loss of smell (taste), diarrhea, etc., and CT imaging has no imaging characteristics of the new coronary pneumonia, and according to the current situation, it cannot be diagnosed as a "confirmed case".
However, some asymptomatic infections may develop into symptomatic confirmed cases, but they are still in the incubation period at present. However, there are also some asymptomatic infected people who are treated with antiviral treatment under the influence of their own immunity or promptly discovered it, but no clinical symptoms appear and the virus is cleared. In addition, there are a few cases, which are asymptomatic infections during the recovery period, which means that the clinical symptoms completely disappear, and other tests are basically normal, but the viral nucleic acid test can still be positive for a period of time. There are three major factors for the increase in asymptomatic infections of
. First of all, it is related to the characteristics of the Omickron mutant strain . With the mutant virus, the Omickron mutant strain has increased infectivity, and the clinical symptoms are relatively mild. In this way, many infected people will not show clinical symptoms after infection. This is a very important feature.
Secondly, it is related to large-scale population immunization. The coverage rate of vaccination is high now, and the human immunity is enhanced after vaccination. Even if is infected, relatively speaking, some symptoms may not show , so vaccination is still very effective.
Third, it is related to early discovery and control. disease control team quickly screened and discovered, so that some early infected people were quickly discovered and detected before they had time to develop symptoms. The more meticulous the work of , the higher the probability of "intercepting" infected people in the early stage, and the more timely disease transmission control is. Asymptomatic infected people are the people who were "intercepted" in the earliest stages of the disease.
Asymptomatic infected people are also contagious
Asymptomatic infected people will infect others? Experts said that asymptomatic only means that the infected person has no symptoms and is also contagious. The transmission route of asymptomatic infected persons is the same as that of confirmed cases. Specifically, it includes air droplet transmission, close contact transmission, and aerosol transmission , etc.
Therefore, according to relevant national requirements, asymptomatic infections should also be conducted for asymptomatic infections to screen close contacts and secondary close contacts, screening for high-risk groups, and corresponding place control measures. The same measures will be taken to control and screen the close contacts of asymptomatic infected persons and secondary close contacts as those of confirmed cases and secondary close contacts.
Source｜People's Daily Fujian Channel Comprehensive Fujian Disease Control Watch Bamin
Editor | Zheng Wenjie Editor | Zheng Zhizhong
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