A little dry cough is not necessarily a new coronavirus infection. There are many causes of dry cough, including colds, allergic rhinitis, nasopharyngitis, etc., and a little dry cough cannot be used to diagnose a new coronavirus infection. New coronavirus infection is mainly manifested by fever, dry cough, fatigue, a few patients with nasal congestion, runny nose, sore throat, myalgia and diarrhea and other symptoms. Severe patients tend to develop respiratory distress and hypoxemia a week after the onset of the disease, and in severe cases, the disease may rapidly progress to acute respiratory distress syndrome and so on. Epidemiologic history and clinical symptoms are required to confirm the diagnosis of novel coronavirus infection. After the diagnosis is made as a suspected case, nucleic acid testing, antibody assay and gene sequencing will be performed to confirm the diagnosis, rather than diagnosing novel coronavirus infection based on the symptom of a little dry cough alone.