Fig. 1

Distribution of different types of specimens in COVID-19 patients. The 12 types of specimens collected from 8 types of tissues to monitor SARS-CoV-2 from the 1008 confirmed severe patient during hospitalization. The 12 types of specimens included nasopharyngeal swab, oropharyngeal swab, sputum, BALF, stool, anal swab, urine, PDF, blood, sweat, CSF, and corneal secretion. 8 types of tissues included respiratory tract, gastrointestinal tract, urinary system, blood, eyes, the nervous system and sweat gland. NS, nasopharyngeal swab; OS, oropharyngeal swab; BALF, bronchoalveolar lavage fluid; PDF, peritoneal dialysis fluid; CSF, cerebrospinal fluid