Nucleic acid is not more accurate the deeper you poke. Nucleic acid test is generally used for pharyngeal swab, the collection site is the pharynx, need to take secretions in the pharynx and tonsils for testing, if poked too deep may enter the esophagus, resulting in taking the secretions of the upper esophagus; and nucleic acid test poked too shallow, picking up the secretions of the oral cavity, regardless of the swab is too deep or too shallow may affect the accuracy of the test. The pharynx and tonsils are the main collection points for nucleic acid collection, and the examination should begin by asking the subject to tilt his head back and open his mouth wide. The sampler uses a cotton swab to cross the root of the tongue to the posterior wall of the pharynx and tonsil crypts, side walls, etc. Repeatedly wipe three to five times to collect mucosal cells, and after the sampling is completed, the swab will be inserted into a test tube and stuffed tightly before being sent for examination in a timely manner. Wear a medical mask during nucleic acid testing to avoid cross-infection, and leave immediately after sampling. If symptoms such as fever and headache occur, go to the fever clinic immediately.