Eating oranges before the nucleic acid test will not be positive. The principle of the nucleic acid test for New Crown Virus is to amplify the gene sequence of the virus, mainly through the method of fluorescent quantitative PCR. If infected with New Crown Virus, then the gene sequence of this virus will be amplified, and then it will be positive through the fluorescent signal. If not infected with the New Crown Virus, then it will not be detected, and the fluorescent signal will be negative. Neocoronavirus can be detected by specific kits for nucleic acid viruses, which are positive when infected. Nothing you eat will test positive for nucleic acid without being infected with Neocoronavirus, including oranges. Nucleic acid test results are mainly related to infection and non-infection, infected with the new crown virus, eat anything will not affect its positive results, on the contrary, no infection eat anything will show negative. Positive nucleic acid tests require prompt isolation and multiple retests at a later stage to ultimately diagnose or rule out the disease.