Nucleic acid testing is categorized into pharyngeal and nasal swabs, and infants can be tested for nucleic acid using the pharyngeal swab. Since infants are more active, if nasal swab is used, the nose of the infant may be injured during the test. Since a throat swab is a better way to extract secretions, it is recommended that infants use a throat swab for nucleic acid testing. It is recommended that infants try not to eat before the nucleic acid test. This is so as not to cause sore throat, nausea, vomiting and other symptoms because the swab irritates the throat. It may even cause the baby to cry, resulting in aspiration and choking. After having the nucleic acid test, you should wear a mask immediately to prevent infection. After the baby has had the nucleic acid test, if there is any abnormality, isolation treatment should be taken immediately.