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Volume 17, Number 10—October 2011

Dispatch

Household Transmission of Pandemic (H1N1) 2009 Virus, Taiwan

Luan-Yin Chang, Wei-Hua Chen, Chun-Yi Lu, Pei-Lan Shao, Tsui-Yien Fan, Ai-Ling Cheng, and Li-Min HuangComments to Author 

Author affiliation: National Taiwan University, Taipei, Taiwan

Main Article

Table 1

Demographic characteristics and pandemic (H1N1) 2009 infection rates among 223 household contacts of 87 index case-patients, by contact type, Taiwan, August–November 2009*

Study participants No. participants Mean age, y (SD) Sex, F/M Positive for pandemic (H1N1) 2009
No. positive/no. tested (%)
By PCR, no. By HI, no./no. tested (%)
Index case-patients
87
10.6 (7.2)
42/45
71
81/84 (96)
87/87 (100)
Household members 223 33.8 (17.9) 122/101 21 59/222 (27)† 60/223 (27)
Children 57 8.0 (3.6) 28/29 21 34/56 (61)† 35/57 (61)
Siblings 56 7.9 (3.6) 28/28 21 34/55 (62)† 35/56 (63)
Cousin 1 11.5 0/1 0 0/1 (0) 0/1 (0)
Adults 166 43.2 (10.5) 94/72 0 25/166 (15) 25/166 (15)
Siblings 5 20.3 (1.7) 3/2 0 0/5 (0) 0/5 (0)
Parents 138 41.0 (5.6) 76/62 0 20/138 (14) 20/138 (14)
Grandparents 18 66.6 (5.9) 11/7 0 4/18 (22) 4/18 (22)
Uncles/aunts
5
41.5 (1.7)
4/1
0
1/5 (20)
1/5 (20)
Total 310 27.5 (18.9) 169/141 92 140/310 (45) 147/310 (47)

*HI, hemagglutination inhibition.
†One person was confirmed to be infected with pandemic (H1N1) 2009 virus by PCR of a throat swab specimen without testing of a blood sample.

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