Nasal secretions may contain nucleic acids of viruses. Nucleic acid test pokes the nasal cavity in order to take out the nasal secretions for laboratory tests to determine whether they are infected with the corresponding viruses. Nucleic acid testing is the collection of body fluids, blood, secretions, excretions, etc. that may contain viruses, which are professionally analyzed to determine whether or not they are infected with the relevant virus. Nucleic acids include Deoxyribonucleic Acid (DNA) and Ribonucleic Acid (RNA). Different types of viruses have different types of nucleic acids, and different parts are collected. For example, the new coronavirus is an RNA virus that mainly infects the mucous membranes of the respiratory tract, including the mucous membranes of the nasal cavity, pharynx, bronchial tubes and other parts of the mucous membranes. After viral infection, viral ribonucleic acid can be detected in the mucous membrane secretions of the respiratory tract, which can confirm the diagnosis of the disease, and the nasal cavity may contain the relevant viruses, so it is necessary to conduct a nasal pharyngeal swab collection. Nucleic acid collection requires professional medical personnel to carry out, and need to strictly follow the collection process, it is recommended to go to a professional collection point, for collection.