Strictly speaking, the novel coronavirus nucleic acid test is neither a blood draw nor a saliva collection; a nasal swab collects nasal secretions and a pharyngeal swab collects pharyngeal secretions. Novel coronavirus pneumonia is a respiratory infection and is usually transmitted via respiratory ejecta. Therefore, the specimens collected are usually nasopharyngeal and oropharyngeal secretions. In some severe cases, bronchial washings, or fluid from the alveoli, may also be collected, which makes collection more difficult, but with a corresponding increase in accuracy. In daily life, the novel coronavirus nucleic acid test used by the general public collects nasal and pharyngeal secretions, not strictly speaking saliva. However, blood sampling is also an important method for novel coronavirus testing. After 7 days of the acute phase, blood can be collected for anticoagulation tests, and bi-directional tests of acute and recovery serum can also be done. These tests are useful for the diagnosis of novel coronavirus pneumonia, but are limited to the application of the patient during treatment. For population-based nucleic acid testing, a nasopharyngeal swab of the nose and an oropharyngeal swab of the oropharynx are used. This is neither saliva nor blood, but respiratory secretions.