Skip to main content

Table 2 The cycle threshold (Ct) value (± standard deviation) of the ORF1ab gene in respiratory specimens (combined nasopharyngeal and throat swabs) in different subgroups of SARS-CoV-2-RT-PCR confirmed cases

From: Performance evaluation of antigen detection rapid diagnostic test (Ag-RDT) for COVID-19 diagnosis in a primary healthcare center during the Shanghai COVID-19 quarantine period

 

Ag-RDT negative

Ag-RDT positive

Mean Ct value

n

Mean Ct value

n

Ct value of ORF1ab gene

< 20

18.99

1

19.07 ± 0.85

10

20 to < 25

23.03 ± 1.26

10

22.03 ± 1.25

13

25 to < 30

27.85 ± 1.44

22

26.7 ± 1.47*

10

> 30

32.27 ± 1.47

14

32.47 ± 2.2

3

Overall

27.95 ± 3.82

47

23.32 ± 4.1***

36

  1. The asterisk (* and ***) indicated significant differences between the Ag-RDT negative and positive groups, whose p value equaled 0.047 and < 0.0001, respectively
Back to article page

Virology Journal

ISSN: 1743-422X