TABLE 1.
Viral culture and RAgT positivity rates according to CT values of gRNAa
| CT value for gE | Tested real-time RT-PCR assays (n) | Positive test results |
|||
|---|---|---|---|---|---|
| sgRNA | RAgT |
Viral culture | |||
| WF | CD | ||||
| Nasal washes | |||||
| <20 | 21 | 21/21 | 21/21 | 21/21 | 20/21 |
| 20−22 | 13 | 13/13 | 13/13 | 13/13 | 8/13 |
| 22−24 | 6 | 6/6 | 6/6 | 6/6 | 0/6 |
| 24−26 | 7 | 7/7 | 7/7 | 4/7 | 2/7 |
| 26−28 | 5 | 5/5 | 1/5 | 0/5 | 0/5 |
| 28−30 | 8 | 8/8 | 1/8 | 0/8 | 0/8 |
| 30−31 | 3 | 1/3 | 0/3 | 0/3 | 0/3 |
| 31−32 | 3 | 0/3 | 0/3 | 0/3 | 0/3 |
| 32−34 | 24 | 0/24 | 0/24 | 0/24 | 0/24 |
| Oropharyngeal swabs | |||||
| <20 | 13 | 13/13 | 13/13 | 13/13 | 13/13 |
| 20−22 | 6 | 6/6 | 6/6 | 6/6 | 6/6 |
| 22−24 | 12 | 12/12 | 11/12 | 11/12 | 6/12 |
| 24−26 | 8 | 8/8 | 5/8 | 4/8 | 0/8 |
| 26−28 | 10 | 9/10 | 2/10 | 1/10 | 0/10 |
| 28−30 | 12 | 5/12 | 2/12 | 2/12 | 0/12 |
| 30−32 | 9 | 0/9 | 0/9 | 0/9 | 0/9 |
| 32−34 | 15 | 0/15 | 0/15 | 0/15 | 0/15 |
| Feces | |||||
| 24−26 | 4 | 4/4 | 3/4 | 2/4 | 1/4 |
| 26−28 | 10 | 8/10 | 4/10 | 2/10 | 1/10 |
| 28−30 | 18 | 9/18 | 1/18 | 1/18 | 0/18 |
| 30−32 | 25 | 10/25 | 0/25 | 0/25 | 0/25 |
| 32−34 | 31 | 0/31 | 0/31 | 0/31 | 0/31 |
a
RAgT, rapid antigen test; CT, threshold cycle; gRNA, genomic RNA; gE, genomic RNA of gene E; RT-PCR, reverse transcription-PCR; sgRNA, subgenomic RNA. CD, Wuhan CDiagnosis; WF, Guangzhou Wondfo.