1, the negative result of nucleic acid detection may not be accurate, because false negative results may appear in the case of incorrect identity information, sample pollution and low virus concentration. If the test result is negative, the possibility of false negative has been ruled out, indicating that there is no infection, so don't worry too much.
2. If the subjects have no obvious clinical symptoms, COVID-19 nucleic acid testing is the nature of comprehensive screening. Generally, the risk of infection in this population is low, and the COVID-19 nucleic acid test is negative, which mostly means that they are not infected, and there is almost no COVID-19 infectivity in this population.
3. If the subject belongs to the middle and high risk group and the nucleic acid test is negative, there may still be a low concentration of COVID-19 in the body, but the nucleic acid is not positive because of the low concentration. For example, COVID-19 may have false negative results in the incubation period, but it is contagious in the incubation period.
4. In addition, if there are irregular sampling and improper collection locations, it may also cause false negatives, but at this time, the human body has been infected with the virus, which is contagious.
It is suggested to pay attention to personal hygiene in daily life, wash hands with warm water and soap in time when going out, wear masks that meet epidemic prevention requirements correctly, and keep a certain distance when communicating with people, which will help reduce the risk of infection.
Will COVID-19's early negative emotions be contagious? Pneumonia patients in COVID-19 are contagious in the early incubation period.
COVID-19 will have an incubation period of 1 to 14 days after infection, and it will be negative. It may be that the virus level is not high and the nucleic acid quantitative examination failed to detect it. However, as long as COVID-19 exists in the body, it is contagious, but the infectivity is low. But the virus replicates a lot in the body, can be excreted by breathing, and then transmitted to others.
It is suggested that some patients who are suspected or highly suspected to have close contact with coronavirus pneumonia should be tested for viral nucleic acid in their blood during monitoring and isolation. If the nucleic acid test is positive or the detected gene sequences are highly homologous, it can be diagnosed as COVID-19's disease. Early diagnosis and isolation treatment are needed to effectively block the source of infection and prevent the spread of the epidemic.
COVID-19 virus is most contagious after a few days of infection, at the end of incubation period and within one week of onset.
At the end of the incubation period, that is, a few days before the onset, novel coronavirus infected patients have begun to excrete the virus. Within a week after the onset, the patient's body has relatively more detoxification, and at this time it is relatively contagious. However, with the extension of the course of disease, the amount of detoxification can be gradually reduced, and the infectivity of patients will gradually decline. With the improvement of the disease, the infectivity can basically be reduced to zero.
4. What is the infection probability of close contacts in COVID-19? In COVID-19, the infection probability of close contacts is relatively high.
Close contacts refer to people who have had close contact with suspected cases and confirmed cases five days before symptoms appear, or people who have had close contact with asymptomatic infected people five days before sampling without effective protective measures, such as living together, taking cars, planes, high-speed trains, ships and other means of transportation, or having close contact with offices, workshops, classrooms, canteens, elevators and other places, or having meals and entertainment in a closed environment.
It can be seen that the close contact between infected people in COVID-19 and COVID-19 is relatively close, while novel coronavirus is a highly contagious disease. If you don't wear protective clothing or wear a mask when you are in contact with an infected person within one meter, you may spread the infection directly through droplets, causing the virus to enter the body quickly.
Therefore, once you find yourself in close contact or sub-close contact, you need to go to the hospital for nucleic acid test and blood test in time to accurately determine whether you are infected with novel coronavirus. At the same time, you need to isolate yourself. During the incubation period, it is best not to contact with family members or other people, so as not to increase the risk of infection of others, and do regular nucleic acid testing. If the test result is always negative within 14 days, it means that you are not infected and you can remove the quarantine.