Chinanews.com, Beijing, May 4th (Xu Jing) Pang Xinghuo, deputy director of the Beijing Center for Disease Control and Prevention and member of the national new coronavirus pneumonia expert group, reported on the 4th that the epidemic analysis found that after many cases of infected people showed respiratory symptoms If the nucleic acid test is still negative, she reminds the public that during the high epidemic period, once 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, they should not be taken lightly. Adhere to scientific wearing of masks, pay attention to hand hygiene and disinfection, reduce gatherings for meals, and do not take public transportation or online car-hailing. It is recommended to carry out 7-day health monitoring and strengthen nucleic acid testing to detect epidemic risks as soon as possible.