Baseball pengzijian but not necessarily nucleic acid positive

According to the "science" rumor list in February, what else is there except that cherizi can't be eaten if it is positive
Pengzhijian, deputy director of the China Center for Disease Control and prevention, said that although many imported products are positive in nucleic acid testing, nucleic acid positivity is not necessarily contagious. Pengzijian said that in the past, people engaged in food processing or processing were infected because they were exposed to the virus for a long time and many times. For consumers