Nasal swabs are not usually positive when a person with a cold is not infected with Neocoronavirus. If a person with a cold is infected with NeoCoronavirus and a nasal swab is taken, the test may be positive. Nasal swabs are taken with a cotton swab from the nasal passages, and a nucleic acid amplification test is used to check for the presence of novel coronavirus in the specimen. In general, if a patient has a cold and is not infected with the novel coronavirus, the nasal swab test is usually not positive. If the patient has a cold and is infected with the novel coronavirus, the nasal swab may be positive. It is recommended that patients undergo a nasal swab test after catching a cold and need to provide the test results to the doctor, who will judge the test results to be positive based on the test results. In addition, patients should rest more, drink more hot water, pay attention to keep warm and avoid getting cold after a cold. After a cold, you need to eat light and easy-to-digest food, such as rice porridge, noodles, vegetable soup, etc. You need to eat less spicy food such as chili or mustard.