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Volume 17, Number 10—October 2011

Research

Pandemic (H1N1) 2009 among Quarantined Close Contacts, Beijing, People’s Republic of China

Xinghuo Pang1, Peng Yang1, Shuang Li, Li Zhang, Lili Tian, Yang Li, Bo Liu, Yi Zhang, Baiwei Liu, Ruogang Huang, Xinyu Li, and Quanyi WangComments to Author 

Author affiliations: Beijing Center for Disease Prevention and Control, Beijing, People’s Republic of China; Capital Medical University School of Public Health and Family Medicine, Beijing

Main Article

Table 2

Characteristics of 613 index case-patients with pandemic (H1N1) 2009 and their close contacts, Beijing, China*

Characteristic No. (%)
Index case-patients
Female sex 265 (43.2)
Locally acquired cases 230 (37.5)
Subclinical infection 12 (2.0)
Infected close contacts
110 (17.9)
Close contacts, n = 7,099
Female sex† 3,514 (50.0)
Relationship to index case-patient
Spouse 75 (1.1)
Other household member 786 (11.1)
Nonrelated roommate 367 (5.2)
Contact at workplace or school 1,610 (22.7)
Nonhousehold relative 177 (2.5)
Passenger on the same flight 3,129 (44.1)
Friend 523 (7.4)
Service person met at public place 432 (6.1)
Contact phase
Exposure to symptomatic index
case-patient during symptomatic phase 4,305 (60.6)
Exposure to symptomatic index
case-patient the day before illness onset 2,642 (37.2)
Exposure to person with subclinical
index case 149 (2.1)
Type of quarantine
Quarantine station 4,988 (70.3)
Home 2,111 (29.7)

*For index case-patients, median age (range) was 20 (1–75) y. For close contacts, median age (range) was 27 (0–99) y (data for 5,979 close contacts available).
†Data for 7,032 close contacts available.

*For index case-patients, median age (range) was 20 (1–75) y. For close contacts, median age (range) was 27 (0–99) y (data for 5,979 close contacts available).
†Data for 7,032 close contacts available.

*For index case-patients, median age (range) was 20 (1–75) y. For close contacts, median age (range) was 27 (0–99) y (data for 5,979 close contacts available).
†Data for 7,032 close contacts available.

Main Article

1These authors contributed equally to this article.

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