For the new coronavirus nucleic acid test, one swab does just 1 nucleic acid because the swab is disposable. Usually, the collection of nucleic acid samples requires the use of swabs to collect secretions from the oropharynx, nasal cavity and anal area. The swabs used for testing nucleic acids are disposable, and one person corresponds to one swab, which can effectively avoid cross infection and reduce the risk of infection. The most commonly used clinical swab is the oropharyngeal swab, which is collected from the tonsils and the posterior wall of the pharynx on both sides of the mouth. In the process of nucleic acid collection, as it will stimulate the pharyngeal wall, it will cause mild discomfort to the person being collected, so there is no need to be too afraid and worried. To summarize, the medical staff will only use one swab for nucleic acid collection once and will not use it more than once.