According to the International Committee on Taxonomy of Viruses (ICTV), The official classification of the novel coronavirus (2019-nCoV) is severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). On the same day, the World Health Organization (WHO) announced that the official name of the disease caused by the virus is COVID-19.

Influenza virus is short for influenza virus. It is divided into three types: A (A), B (B) and C (C), and influenza viruses discovered in recent years will be classified as D (D). Influenza virus can cause human, poultry, pigs, horses, bats and other animals infection and disease, human influenza, avian influenza, swine influenza, equine influenza and other human and animal diseases. The typical clinical symptoms of these diseases are acute high fever, generalized pain, significant weakness, and respiratory symptoms.