Nucleic acid collection sites mainly include the nose, throat, larynx, veins, and anus. Nucleic acid testing is a technique that uses specimens from the patient’s respiratory tract, blood, or feces to determine the presence of nucleic acids from the relevant pathogens in the human body, and ultimately whether or not the patient is infected with the relevant pathogens. If the nucleic acid test is positive, then it can be determined that a pathogen, such as a virus or bacteria, is present in the patient’s body. Nucleic acids are collected from the nose, throat, larynx, veins, anus and other parts of the body. The corresponding nucleic acid tests are nasopharyngeal swabs, oropharyngeal swabs, serologic tests, and anal swabs. Regardless of the method of nucleic acid testing, effective protective measures are required before or after the test. If there are symptoms such as fever, dry cough, sore throat, conjunctivitis, muscle pain, change in taste and smell, diarrhea, etc., it is important to go to the hospital for another nucleic acid test in time, so as to achieve timely detection and timely isolation and treatment to avoid serious situations.