Bulletin of the World Health Organization
Print version ISSN 0042-9686
CRUMP, John A.; LUBY, Stephen P. and MINTZ, Eric D.. The global burden of typhoid fever. Bull World Health Organ [online]. 2004, vol.82, n.5, pp. 346-353. ISSN 0042-9686. http://dx.doi.org/10.1590/S0042-96862004000500008.
OBJECTIVE: To use new data to make a revised estimate of the global burden of typhoid fever, an accurate understanding of which is necessary to guide public health decisions for disease control and prevention efforts. METHODS: Population-based studies using confirmation by blood culture of typhoid fever cases were sought by computer search of the multilingual scientific literature. Where there were no eligible studies, data were extrapolated from neighbouring countries and regions. Age-incidence curves were used to model rates measured among narrow age cohorts to the general population. One-way sensitivity analysis was performed to explore the sensitivity of the estimate to the assumptions. The burden of paratyphoid fever was derived by a proportional method. FINDINGS: A total of 22 eligible studies were identified. Regions with high incidence of typhoid fever (>100/100 000 cases/year) include south-central Asia and south-east Asia. Regions of medium incidence (10-100/100 000 cases/year) include the rest of Asia, Africa, Latin America and the Caribbean, and Oceania, except for Australia and New Zealand. Europe, North America, and the rest of the developed world have low incidence of typhoid fever (<10/100 000 cases/year). We estimate that typhoid fever caused 21 650 974 illnesses and 216 510 deaths during 2000 and that paratyphoid fever caused 5 412 744 illnesses. CONCLUSION: New data and improved understanding of typhoid fever epidemiology enabled us to refine the global typhoid burden estimate, which remains considerable. More detailed incidence studies in selected countries and regions, particularly Africa, are needed to further improve the estimate.
Keywords : Typhoid fever [epidemiology]; Typhoid fever [blood]; Paratyphoid fever [epidemiology]; Salmonella enterica [isolation and purification]; Cohort studies; Population surveillance; Cost of illness; Sensitivity and specificity.