Volume 10, Number 2—February 2004
THEME ISSUE
2004 SARS Edition
SARS Transmission
Probable Secondary Infections in Households of SARS Patients in Hong Kong
Joseph T.F. Lau*
, Mason Lau*, Jean H. Kim*, Eric Wong*, Hi-Yi Tsui*, Thomas Tsang†, and Tze Wai Wong‡
, Mason Lau*, Jean H. Kim*, Eric Wong*, Hi-Yi Tsui*, Thomas Tsang†, and Tze Wai Wong‡
Table 3
Household attack rates (HAR) and household member attack rates (HMAR) for different categories of index patient
| % attack rate |
Overall | Odds ratio (95% CI)a | chi-square p value | ||
|---|---|---|---|---|---|
| Type of index patient | Date IP’s fever onset |
||||
| <March 25, 2003 | >March 25, 2003 | ||||
| HAR |
|||||
| Hospital workers |
n = 114 |
n = 153 |
n = 267 |
||
| 7.0 (3.1–13.4) |
1.3 (0.2–4.6) |
3.8 (1.8–6.8) |
0.18 (0.02 to 0.91)b |
0.021 |
|
| Other community members |
n=148 |
n = 322 |
n = 471 |
||
| 29.1 (21.9–37.1) |
13.4 (9.8–17.6) |
18.3 (14.9–22.1) |
0.38 (0.23 to 0.62) |
<0.001 |
|
| Amoy Gardens Block E residents |
n = 12 |
n = 24 |
n = 36 |
||
| 50.0 (21.1– 78.9) |
33.3 (15.6–55.3) |
38.9 (23.1–56.5) |
0.50 (0.10, to 2.54) |
0.441c |
|
| Amoy Gardens other Block residents |
n = 25 |
n = 82 |
n = 107 |
||
| 40.0 (21.1–61.3) |
13.4 (6.9–22.7) |
19.6 (12.6–28.4) |
0.23 (0.07, 0.72) |
0.008c |
|
| All households of all IP |
n = 299 |
n = 581 |
n = 881 |
||
| 22.4 (17.8–27.6) |
11.0 (8.6–13.9) |
14.9 (12.6–17.4) |
0.43 (0.29, 0.63) |
<0.001 |
|
| HMAR |
|||||
| Hospital workers |
n = 349 |
n = 381 |
n = 730 |
||
| 3.4 (1.8–5.9) |
0.5 (0.06–1.9) |
1.9 (1.1–3.2) |
0.15 (0.02, 0.67)2 |
0.004 |
|
| Other community members |
n = 392 |
n = 866 |
n = 1,261 |
||
| 15.8 (12.4–19.8) |
7.2 (5.5–9.1) |
9.8 (8.3–11.6) |
0.41 (0.28, 0.61) |
<0.001 |
|
| Amoy Gardens residents (Block E) |
n = 27 |
n = 51 |
n = 78 |
||
| 37.0 (19.4–57.6) |
17.7 (8.4–30.9) |
24.4 (15.4–35.4) |
0.36 (0.11, 1.19) |
0.058 |
|
| Amoy Gardens residents (non-Block E) |
n = 59 |
n = 196 |
n = 255 |
||
| 22.0 (12.3–34.7) |
7.7 (4.4–12.3) |
11.0 (7.4–15.5) |
0.29 (0.12, 0.71) |
0.002 |
|
| All households of all IP | n = 827 |
n = 1,494 |
n = 2,324 |
||
| 11.7 (9.6–14.1) | 5.9 (4.8–7.2) | 8.0 (6.9–9.1) | 0.47 (0.34, 0.64) | <0.001 | |
aThe reference group is before March 25.
bExact 95% CI.
cFisher exact test p value
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Page updated: February 03, 2011
Page reviewed: February 03, 2011
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