Whether children need to do nucleic acid testing has nothing to do with their age, and they need to actively cooperate with the local regulations, but mainly depends on whether they have been in contact with high-risk groups and whether they are in high-risk areas, etc. The details are analyzed as follows: If the child is in a non-medium-high risk area and has not been in contact with infected persons or high-risk groups, he/she generally does not need to take the initiative to take the nucleic acid test if not required by the relevant local requirements and regulations. However, if the child is in an intermediate to high risk area or has been in contact with infected or indirectly infected persons, or is engaged in activities across provinces or countries, then nucleic acid testing is required to determine the presence or absence of infection. Nucleic acid testing has nothing to do with age, and parents need to strictly follow the relevant regulations and requirements of the region they live in. If necessary, the child needs to be taken for nucleic acid testing.