There is no certainty that a dry cough for a few days could be Neoconjunctivitis. First of all, coughing does not necessarily mean neoconiosis, but of course neoconiosis can cause coughing. But besides neoconiosis, many diseases can cause cough, such as laryngitis, bronchitis, asthma, chronic rash, chronic obstructive pulmonary disease, etc., including tuberculosis can cause cough. Therefore, there are many similar diseases that manifest as a dry cough, which should not be taken as a basis for diagnosing neoconjunctivitis. There is no accurate time for the study of patients with new coronavirus pneumonia that can tell us to consider new coronavirus pneumonia when the dry cough is more than a few days old. Therefore, the diagnosis of Neoplastic coronavirus pneumonia requires a combination of clinical plus imaging plus laboratory tests to ultimately determine the disease.