Diarrhea is not specific for NCCP infection, so it is important to visit a hospital promptly when diarrhea is present and to determine the cause of the disease in conjunction with an examination. In the early stages of NCCP, most patients have fever, dry cough, and malaise as the main symptoms, while a few patients have upper respiratory and gastrointestinal symptoms such as nasal congestion, runny nose, and diarrhea. When diarrhea is present, epidemiologic history, imaging and etiologic examination are needed to further confirm whether the diarrhea is caused by NCCP, and the epidemiologic history is to ask whether the patient has a history of close contact with NCCP and whether he or she has been to an outbreak risk area. Pathogenic tests using nucleic acid tests for IgM and IgG may show double positivity. If the diagnosis is confirmed by tests, active treatment is required. If the test results suggest that the disease is not neoconjunctivitis, further tests are needed to determine the cause.