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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*Comments to Author , Mason Lau*, Jean H. Kim*, Eric Wong*, Hi-Yi Tsui*, Thomas Tsang†, and Tze Wai Wong‡
Author affiliations: *Chinese University of Hong Kong, Hong Kong Special Administrative Region, People’s Republic of China (SAR); †Department of Health, Hong Kong SAR; ‡Chinese University of Hong Kong, Department of Community and Family Medicine, Hong Kong SAR

Main Article

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

Main Article

Page created: February 03, 2011
Page updated: February 03, 2011
Page reviewed: February 03, 2011
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