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Volume 11, Number 3—March 2005

Research

Malaria Risk in Travelers

Helena Hervius Askling*†, Jenny Nilsson*†, Anders Tegnell*, Ragnhild Janzon*, and Karl Ekdahl*‡Comments to Author 
Author affiliations: *Swedish Institute for Infectious Disease Control, Stockholm, Sweden; †Karolinska University Hospital, Stockholm, Sweden; ‡Karolinska Institute, Stockholm, Sweden

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Table 5

Malaria risk for officially reported travelers compared to incidence (as reported to WHO, 2001*) and estimated rate (based on TDB) in corresponding region†

Data from in-flight/visa Data from TDB
Country
Y
Cases
No. of travelers
Risk/100,000
No. of 
travelers
Risk/100,000
95% CI
Data from WHO
incidence/100,000
Thailand 2001–2002 9 453,000 2.0 435,000 2.1 1.0–4.2 100
India 2001–2003 7 48,687 14.4 192
Indian subcontinent 2001–2003 25‡ 72,000 35 17-71
Gambia 1997–2003 79 31,242 253 10.096
West Africa 1997–2003 242§ 80,000 302 196–468
South Africa 1997–2001 3 98,886 3 61
Southern Africa 1997–2001 63¶ 128,000 49 32–76

*Information from The Gambia was from 1999.
†WHO, World Health Organization (15);TDB, Swedish Travel and Tourist Database; CI, confidence intervals.
‡7 cases from India, 13 cases from Afghanistan, and 5 cases from Pakistan.
§6 cases from Benin, 4 cases from Burkina Faso, 31 cases from Ivory Coast, 79 cases from The Gambia, 65 cases from Ghana, 11 cases from Guinea, 5 cases from Guinea-Bissau, 11 cases from Liberia, 3 cases from Mali, 11 cases from Senegal, 11 cases from Sierra Leone, and 5 cases from Togo.
¶14 cases from Angola, 5 cases in Madagascar, 8 cases from Malawi, 13 cases from Mozambique, 3 cases from Namibia, 3 cases from South Africa, 7 cases from Zambia, and 10 cases from Zimbabwe.

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