Pharyngeal swabs are commonly used to check the respiratory system infectious diseases, generally fever, cough, sore throat and other symptoms, the need to clarify the pathogen, usually do a throat swab to check the patient’s throat whether there is a bacterial, fungal, or viral and other microbial infections, but also to clarify the type of microorganisms, and according to the results of the test to guide the use of medication. The more common diseases are tonsillitis, new crown pneumonia, acute pharyngitis and other diseases. 1, tonsillitis: belong to the common upper respiratory tract infectious diseases, usually due to the palatine tonsil infection, and cause redness, swelling, bleeding, pharyngeal sensation of foreign body and other symptoms, the available pharyngeal swabs to clarify whether there is a tonsillitis infection as well as the causative organisms species, and the use of sensitive medications for treatment. 2, new crown pneumonia: new crown pneumonia is mainly attacked the respiratory tract, and spread by respiratory tract, the new crown pneumonia. New coronary pneumonia: new coronary pneumonia mainly attacks the respiratory tract and mainly spreads through the respiratory tract, so there are relatively more viruses in the pharynx, and the throat swab is a simple and fast way to check the new coronary virus, which can initially clarify whether there is a new coronary virus infection in the patient; 3. Acute pharyngolaryngitis: due to the viral and bacterial invasion, the pharyngeal mucous membrane will often appear to be diffuse congestion, swelling, and the pharyngeal bacteria usually come from the external environment, so doing a throat swab bacteria culture can effectively clarify the causative organisms. The culture of pharyngeal swabs can be used to identify the causative organisms and select the more sensitive antibiotics according to the organisms. Pharyngeal swabs can also be used to examine whooping cough, diphtheria and other respiratory diseases. The main method of examination is to use a tongue depressor to depress the tongue and take a clean cotton swab dipped in the throat secretion for examination. Some patients will experience slight discomfort during the throat swab examination, such as nausea and vomiting, and it is recommended that patients do not eat two hours before the examination in order to avoid reflux or aspiration.