1.3 Etiological Detection
During the field investigation, throat swabs were collected from patients who did not take antiviral drugs within 3 days of onset and met the case definition. SARS-COV-2 and influenza nucleic acid was tested by Real-time quantitative PCR (qPCR) within 6 hours after the samples were collected, and NxTAG Respiratory Pathogen Panel (LOT: XK051C-1045, Luminex, USA) was used to test for the respiratory poly-pathogen nucleic acid. Influenza virus (subtype AH1, AH3), A (H1N1)pdm09, influenza B virus, respiratory syncytial virus and parainfluenza virus (1, 2, 3, 4), Bocavirus, Human metapneumovirus (HMPV), HRV, adenovirus, coronavirus (OC43, 229E, HKU-1, NL63), legionella, mycoplasma pneumoniae (MP) and chlamydia pneumonia (CP) was included. All testes were followed by the manufacturers’ instructions.