Volume 10, Number 3—March 2004
Dispatch
Immunofluorescence Assay for Serologic Diagnosis of SARS
Paul K.S. Chan*
, King-Cheung Ng*, Rickjason C. W. Chan*, Rebecca K. Y. Lam*, Viola C. Y. Chow*, Mamie Hui*, Alan Wu*, Nelson Lee*, Florence H.Y. Yap*, Frankie W. T. Cheng*, Joseph J. Y. Sung*, and John S. Tam*
, King-Cheung Ng*, Rickjason C. W. Chan*, Rebecca K. Y. Lam*, Viola C. Y. Chow*, Mamie Hui*, Alan Wu*, Nelson Lee*, Florence H.Y. Yap*, Frankie W. T. Cheng*, Joseph J. Y. Sung*, and John S. Tam*Table
Anti-SARS-CoV IgG positive rate and titer according to time of blood sample collectiona
| Time of sample collection after onset of fever | No. of samples tested | No. (%) of samples with anti–SARS IgG antibody detected | Anti-SARS IgG antibody titer, range (mode) |
|---|---|---|---|
| 1–5 days |
64 |
0 |
– |
| 6–10 days |
35 |
12 (34.3) |
40–320 (160) |
| 11–15 days |
23 |
18 (78.3) |
40–640 (320) |
| 16–20 days |
43 |
42 (97.7) |
40–2,560 (640) |
| 21–37b days | 47 | 47 (100) | 80–5,120 (640) |
aSARS, severe acute respiratory syndrome; CoV, coronavirus; IgG, immunoglobulin G; –, not applicable.
bMedian collection time: 22 days; interquartile range: 4 days
