According to Chinese media, analysis of the epidemic situation showed that the nucleic acid test was still negative after many infected people were found to have respiratory symptoms." The Beijing Center for Disease Control and Prevention reminded citizens that there may be symptoms such as fever, dry cough, expectoration, sore throat, fatigue, diarrhea, abnormal sense of taste or smell, even if the nucleic acid test is negative, this should not be be treated lightly.
Why is the nucleic acid test still negative after the onset of respiratory symptoms? How to properly prevent and detect the onset of respiratory symptoms?
According to Chinese media, one of the characteristics of the variant strain (VOC) of concern identified by the WHO is a mutation of the new coronavirus. Due to the genetic mutation, the new variant strain affects the detection efficiency of existing nucleic acid detection methods, and even cannot be detected, identified at an early stage and in a timely manner.
Patients with symptoms need to be considered whether they come from medium and high risk areas or are close or sub-close contacts of new coronavirus infections, if so, report in time and retest nucleic acids. In addition, residents with respiratory symptoms, especially those with fever, should immediately wear masks, avoid crowds or other people when coughing or sneezing if possible, try to stay more than 1 meter away from people, seek medical attention in time for a clear diagnosis, and stay home on time.
Because of this, the nasopharyngeal swab detection method is recommended for people with symptoms, people in closed control areas, and people with an epidemiological history, because the accuracy of nasopharyngeal swabs will be higher than that of oropharyngeal swabs.