Routine blood manifestations of novel coronavirus pneumonia may present with a normal or decreased total white blood cell count. Novel coronavirus pneumonia is a viral infection. Many patients with elevated white blood cell counts after a visit to the clinic may be associated with a bacterial infection and can be simply ruled out based on this information. Lymphocyte counts may be reduced in viral infections. If there is a normal or decreased total white blood cell count and a decreased lymphocyte count, combined with CT changes or other epidemiologic history abnormalities, a novel coronavirus infection should be highly suspected. Routine blood tests for novel coronavirus are diagnostic aids and have great diagnostic value, but they cannot be used as a confirmatory test, which requires nucleic acid testing at the CDC. Novel coronavirus is a relatively special virus that requires more detailed examination because its symptoms are somewhat similar to those of the common cold, and it is necessary to try to prevent misdiagnosis. Content source: Dr. You Lai