Services on Demand
Revista de Saúde Pública
Print version ISSN 0034-8910
MAIA-ELKHOURY, Ana Nilce Silveira; CARMO, Eduardo Hage; SOUSA-GOMES, Marcia Leite and MOTA, Eduardo. Analysis of visceral leishmaniasis reports by the capture-recapture method. Rev. Saúde Pública [online]. 2007, vol.41, n.6, pp. 931-937. ISSN 0034-8910. http://dx.doi.org/10.1590/S0034-89102007000600007.
OBJECTIVE: To analyze the number of cases, deaths, incidence and fatality rate due to visceral leishmaniasis, and to estimate its underreporting, as well as the coverage of the national information systems. METHODS: Confirmed cases of visceral leishmaniasis were analyzed, based on the following systems: the Sistema de Informação de Agravos de Notificação (SINAN - Information System on Disease Notification), the Sistema de Informações sobre Mortalidade (SIM - Mortality Information System) and the Sistema de Informações Hospitalares (SIH - Hospital Information System), between 2002 and 2003. The variables utilized in relationship for pair identification were: patient's name, mother's name, date of birth, gender, city of residence, and mailing address. The capture-recapture method was applied to calculate the estimates, by means of the Chapman formula. RESULTS: The estimated underreporting of visceral leishmaniasis in the SINAN, in relation to the SIH and the SIM, was 42.2% and 45.0% respectively. The estimated underreporting of deaths was 53% and 46.5%, when compared to SINAN-deaths and SIH-deaths respectively. The estimated incidence was 2.9 per 100,000 inhabitants, from the comparison between the SINAN and the SIH, 70.5% higher than the one found when SINAN's data were the only ones utilized. Furthermore, when comparing data from SIM and SINAN-deaths, an estimated fatality rate of 8% was observed, representing an increase in 16% from the one initially registered in the SINAN-deaths. CONCLUSIONS: The results show high estimated underreporting of cases and deaths due to visceral leishmaniasis in Brazil. The relationship between information systems and the capture-recapture method application enabled to know and improve the epidemiological estimates, making its utilization in health services feasible.
Keywords : Leishmaniasis, visceral; Epidemiology; Capture-recapture; Disease notification; underregistration; Information systems.