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Volume 10, Number 5—May 2004

Research

Laboratory Diagnosis of SARS

Paul K.S. Chan*Comments to Author , Wing-Kin To†, King-Cheung Ng*, Rebecca K. Y. Lam*, Tak-Keung Ng†, Rickjason C. W. Chan*Comments to Author , Alan Wu*, Wai-Cho Yu†, Nelson Lee*, David S. C. Hui*, Sik-To Lai†, Ellis K. L. Hon*, Chi-Kong Li*, Joseph J. Y. Sung*, and John S. Tam*
Author affiliations: *The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, New Territories, Hong Kong SAR, China; †Princess Margaret Hospital, Kowloon, Hong Kong SAR, China

Main Article

Table 3

Comparison on positive rates of RT-PCR and virus isolationa

Specimen type (no.) No. (%) of specimens tested positiveb
Isolation/RT-PCR indexc
RT-PCR Virus isolation
Pooled throat and nasal swab (30)
8 (26.7)
4 (13.3)
0.50
Tracheal aspirate (13)
6 (46.2)
2 (15.4)
0.33
Nasopharyngeal aspirate (183)
52 (28.4)
14 (7.7)
0.27
Throat swab (58)
11 (19.0)
2 (3.4)
0.18
Nasal swab (56)
14 (25.0)
2 (3.6)
0.14
Urine (296)
14 (4.7)
2 (0.7)
0.14
Throat washing (218)
17 (7.8)
1 (0.5)
0.06
Stool (262)
70 (26.7)
2 (0.8)
0.03
Rectal swab (56) 12 (21.4) 0 (0) 0

aRT-PCR, reverse transcription–polymerase chain reaction.
bOnly specimens tested by both RT-PCR and virus isolation are included.
cNo. of isolation-positive specimens per RT-PCR-positive specimen.

Main Article

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