According to the current scientific research reports at home and abroad, the new crown re-positive patients have not been found to be infectious, but if the patient is re-infected, it is possible that there is infectiousness. Researchers have conducted virus culture on some of the specimens of new coronavirus repositive-positive patients, but no live virus has been cultured; gene sequencing has not detected the complete gene sequence of the new coronavirus, suggesting that it is only the nucleic acid fragment of the virus, that is, the dead virus, which is not contagious. However, if the patient is re-infected or infected with a different strain, there may be infectiousness. Given the short period of time that humans have known about the new coronavirus, and the lack of widespread tracking and monitoring of the population of new coronavirus re-infected patients, the possibility of infectiousness cannot be ruled out. To be on the safe side, it is also important to take personal precautions, such as wearing a mask and paying attention to hand hygiene.