Neocoronavirus is not contagious, but it is contagious if it is false negative. 1. New coronary nucleic acid negative: if the test result of new coronary nucleic acid suggests negative, then this situation indicates that there is no infection of the new coronary virus, no infection of the virus does not exist infectious. 2. False-negative new crown nucleic acid: in the new crown nucleic acid test, if because of the weather, reagents damp sampling process irregular operation, sample damage and many other factors, may lead to the new crown nucleic acid test false-negative results. At this time, the patient is infected with the new crown virus, but the nucleic acid test appears false negative, this situation patient is infectious. Therefore, the new crown nucleic acid test negative normally is not infectious, but if the new crown nucleic acid test result is false negative, then the patient is infectious. It is recommended to do a good job of personal hygiene protection, go out to wear a good mask, wash your hands often, more indoor ventilation, if at any time fever, cough and other discomforts, to seek medical attention as soon as possible.