Volume 16, Number 1—January 2010
Research
Epidemiology of Travel-associated Pandemic (H1N1) 2009 Infection in 116 Patients, Singapore
Pratik Mukherjee, Poh Lian Lim
, Angela Chow, Timothy Barkham, Eillyne Seow, Mar Kyaw Win, Arlene Chua, Yee Sin Leo, and Mark I-Cheng Chen
, Angela Chow, Timothy Barkham, Eillyne Seow, Mar Kyaw Win, Arlene Chua, Yee Sin Leo, and Mark I-Cheng ChenTable 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.
