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Volume 16, Number 1—January 2010

Research

Epidemiology of Travel-associated Pandemic (H1N1) 2009 Infection in 116 Patients, Singapore

Pratik Mukherjee, Poh Lian LimComments to Author , Angela Chow, Timothy Barkham, Eillyne Seow, Mar Kyaw Win, Arlene Chua, Yee Sin Leo, and Mark I-Cheng Chen
Author affiliations: Tan Tock Seng Hospital, Singapore (P. Mukherjee, P.L. Lim, A. Chow, T. Barkham, E. Seow, M.K. Win, A. Chua, Y.S. Leo, M.I-C. Chen); National University of Singapore, Singapore (A. Chow, M.I-C. Chen); Duke–National University of Singapore Graduate Medical School, Singapore (M.I-C. Chen)

Main Article

Table 1

Demographic and travel-related data for 116 persons with travel-associated pandemic (H1N1) 2009, Singapore, April 26–June 27, 2009*

Data Case-patients, no. (%)
Sex
M 59 (50.9)
F
57 (49.1)
Age group, y
<19 18 (15.5)
20–29 63 (54.3)
30–39 13 (11.2)
40–49 14 (12.1)
>50
8 (6.9)
Nationality
Singaporean 58 (50.0)
Others
58 (50.0)
Port of embarkation, by region
Americas 22 (19.0)
Asia 56 (48.3)
Australasia 31 (26.7)
Europe
7 (6.1)
Duration of travel, h
<3 22 (19.0)
3–5.9 34 (29.3)
6–14.9 36 (31.0)
>15
24 (20.7)
Onset of symptoms
Before embarkation 29 (25.0)
While travelling 17 (14.7)
After disembarkation
70 (60.3)
Source of referral to TTSH screening center
Airport doctor 15 (12.9)
Community doctor 50 (43.1)
Self-referred
51 (44.0)
Screening criteria documented during clinical examination
Temperature >37.5°C 84 (72.4)
Temperature >37.8°C 71 (61.2)
Temperature >38.0°C 61 (52.6)
US CDC ILI criteria† 60 (51.7)
WHO ILI criteria‡
51 (44.0)
Arrival at TTSH, by epidemiologic week§
21 5 (4.3)
22 8 (6.9)
23 13 (11.2)
24 41 (35.3)
25 49 (42.2)

*TTSH, Tan Tock Seng Hospital, Singapore; US CDC, US Centers for Disease Control and Prevention; ILI, influenza-like illness; WHO, World Health Organization.
†Temperature >37.8°C plus cough or sore throat.
‡Temperature >38.0°C plus cough or sore throat.
§Week 21, May 24–30; week 22, May 30–June 6; week 23, June 7-13; week 24, June 14–20; week 25, June 21–27.

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