The male patients are 2251, female are 2629. There is no obvious gender difference during sample collection. But for male, 40.43% were positive while for female, 36.71% were positive. All the cases were
suspected of SARS-CoV-2 infection because of, 1) typical respiratory infection
symptoms such as fever, cough and dyspnoea, or 2) close contact with a COVID-19
patient. RT-PCR were performed to detect ORF1ab and NP genes fragments from
respiratory specimens, including nasal and pharyngeal swabs (NPS), bronchoalveolar
lavage fluid (BLF) and sputum.