A mild cough is not necessarily a new coronavirus, because a mild cough is a symptom that can occur in a variety of diseases. One of the most common is like a cold and bronchitis laryngitis, or some like asthma, chronic bronchitis, these diseases can lead to a slight cough. Specifically what causes the cough, you need to go to the hospital to check some of the tests, such as routine blood, lung function, chest X-ray, these tests can be used as a basis for diagnosis of the disease. If you want to exclude yourself from the new coronavirus, you need to go to the hospital to do the nucleic acid test of respiratory secretions or blood nucleic acid test, only when the nucleic acid is positive can confirm the diagnosis of the new coronavirus, the symptomatology is not able to be used as a confirmation of the diagnosis of coronavirus evidence.