What should a service unit that helps collect nucleic acids locally as a volunteer write?

volunteer+assisting unit should be written.

the substance to be detected by nucleic acid is the nucleic acid of virus. Nucleic acid detection is to find out whether there is nucleic acid of foreign invading virus in respiratory tract samples, blood or feces of patients, so as to determine whether they are infected by Covid-19.

At present, nucleic acid detection includes oropharyngeal swab sampling and nasopharyngeal swab sampling, both of which take a short time. For example, when collecting oropharyngeal swab, the examiner needs to lean back and open his mouth to make an "ah" sound, which is helpful to expose the throat.