A positive nucleic acid test for novel coronavirus confirms the diagnosis of novel coronavirus infection. Its main symptoms are fever, malaise, chills and mainly dry cough. Some patients do not have fever and may present with clinical manifestations such as chest tightness and dyspnea. However, there is a possibility of virus mutation, so if the gene sequence of the virus isolated from respiratory samples or blood samples is highly homologous with the known novel coronavirus, it can also be considered as novel coronavirus infection.