对于去过疫情中高风险地区的人员，如果出现发热和呼吸道症状，一次核酸检测阴性存在假阴性可能，所以也需要两次核酸检测才能排除。
For those who have been to the high-risk areas for the pandemic, if fever and respiratory symptoms occur, there may be a possibility of false negatives in nucleic acid testing, so another nucleic acid test is needed.