PMC:7170415 / 16481-17305 9 Projects
Annnotations
| Id | Subject | Object | Predicate | Lexical cue |
|---|---|---|---|---|
| T122 | 300-413 | Sentence | denotes | Serum and urine are usually negative for the presence of viral nucleic acid, regardless of illness severity (33). |
| T123 | 414-575 | Sentence | denotes | Of importance, the ability of RT-PCR assays to rule out COVID-19 on the basis of upper respiratory tract samples obtained at a single time point remains unclear. |
| T124 | 576-824 | Sentence | denotes | Conversely, after a patient has had a positive test result, several authorities have recommended obtaining at least 2 negative upper respiratory tract samples, collected at intervals of 24 hours or longer, to document SARS–CoV-2 clearance (37, 38). |