After patients with new coronary pneumonia recovered and were discharged from the hospital, some of them experienced "re-positive" phenomenon. So, what is "re-yang"? Is it contagious after "re-positive"? Is treatment needed? Gansu Provincial Disease Control Experts answered one by one.
What is "Fuyang"?
"Re-positive" refers to the situation in which new coronavirus nucleic acid test for is positive again after a person with positive coronavirus infection is released from isolation or discharged from the hospital (cabin). The Ct value of nucleic acid test for patients with "re-positive" is generally ≥35. If there are no symptoms and no management is required, they are safe in life and work. Why does
"re-positive"?
Experts introduced that there are two reasons for this result: 1. Intermittently discharged virus fragments; 2. Re-infection of another novel coronavirus mutant strain.
Before analyzing the above two reasons, we need to review the relevant concepts of the Ct value of the new coronavirus. Ct value , its full name is Cycle threshold, which is the cycle number threshold. Currently, nucleic acid detection uses polymerase chain reaction (PCR) technology.
PCR technology can detect whether there is a virus, but it cannot distinguish whether the virus is active - that is, whether it is a "live virus" with infectious ability or a "dead virus" without infectious ability (virus fragments), it cannot be judged. There are literature reports that the recovered population of discharged (cabin) did not have a live virus isolated after "re-positiveness", and "re-positiveness" may be a detected inactivated virus fragment.
Therefore, when the PCR technology of the personnel is positive after discharge (cabin) is not equivalent to being contagious, because for patients in the recovery period, when the Ct value is ≥35, the living virus can no longer be isolated, and the patient is not contagious at this time. Therefore, if this is the case, the "re-positive" person is not contagious, so there is no need to panic; if there is a "re-positive" case around you and there is no next step of treatment and community control, it is often because its Ct value is ≥35, which means that such patients are no longer contagious, so they do not need to wear tinted glasses and deliberately avoid it.
In addition, antibodies will gradually be produced 1-2 weeks after the human body is infected with the new coronavirus, but as time goes by, the antibody level will decrease, and the strain is constantly mutating. Previously, there have been cases of recovered people being infected with new strains, so recovered people still have the possibility of reinfecting the mutated strain. For whether the "re-positive" population is contagious, it is necessary to comprehensively judge the transmission risk based on Ct values and other factors.
Experts explain in detail
Experts point out that if the nucleic acid test prompt is positive, it needs to be carefully analyzed and identified according to the management principles of the prevention and control guidelines, the following are the following:
1. If the Ct value is ≥35, there are no symptoms and signs at all, no management is required, and close contacts are not required (people who live with them, work together, etc. frequently contact);
2. If the Ct value is ≥35, if there are related clinical manifestations such as fever, cough , or Ct imaging shows lung lesions Aggravates, it should be transferred to designated medical institution , and classified management and treatment are carried out according to the condition, but there is no need to track and manage close contacts;
3. If the Ct value is less than 35, there are no symptoms and signs, it is necessary to quickly evaluate the transmission risk based on the course of the disease, dynamic changes in the Ct value, etc. (The transmission risk will be scientifically determined by relevant professionals). If there is a transmission risk, it will be managed as an infected person. Determine and control close contacts, but there is no need to determine the close contacts of close contacts; if there is no risk of transmission, no longer control is carried out, and no need to determine the close contacts;
4. If the Ct value is less than 35, and there are related clinical manifestations such as fever and cough, or if the Ct imaging shows that the lung lesions are aggravated, it should be transferred to a designated medical institution immediately and classified management and treatment according to the condition. At the same time, it is necessary to determine and control the close contacts, and there is no need to determine the close contacts of close contacts.
com Source丨New Gansu·Daily Gansu Network, Gansu Health Education
