Prevalence of schistosomiasis mansoni in indigenous Maxakali villages, Minas Gerais, Brazil

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open access
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Article
Date
2018
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Instituto de Medicina Tropical de São Paulo
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Universidade Federal de Ouro Preto. Escola de Medicina. Laboratório de Epidemiologia. Ouro Preto, MG, Brasil / Universidade Federal de Ouro Preto. Núcleo de Pesquisa em Ciências Biológicas. Programa de Pós-Graduação em Ciências Biológicas. Ouro Preto, MG, Brasil.
Fundação Oswaldo Cruz. Instituto René Rachou. Laboratório de Esquistossomose, Belo Horizonte, MG, Brasil.
Universidade Federal de Ouro Preto. Escola de Medicina. Laboratório de Epidemiologia. Ouro Preto, MG, Brasil / Universidade Federal de Ouro Preto. Núcleo de Pesquisa em Ciências Biológicas. Programa de Pós-Graduação em Ciências Biológicas. Ouro Preto, MG, Brasil.
Universidade Federal de Ouro Preto. Escola de Medicina. Laboratório de Epidemiologia. Ouro Preto, MG, Brasil.
Universidade Federal de Ouro Preto. Escola de Medicina. Laboratório de Epidemiologia. Ouro Preto, MG, Brasil / Universidade Federal de Ouro Preto. Programa de Pós-Graduação em Saúde e Nutrição. Ouro Preto, MG, Brasil.
Universidade Federal de Ouro Preto. Escola de Medicina. Laboratório de Epidemiologia. Ouro Preto, MG, Brasil.
Ministério da Saúde. Secretaria Especial de Saúde Indígena. Brasília, DF, Brasil.
Universidade Federal de Ouro Preto. Escola de Medicina. Laboratório de Epidemiologia. Ouro Preto, MG, Brasil.
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Abstract
Abstract
Intestinal parasitic infections are a common health problem among Amerindian populations and schistosomiasis represents one of the most prevalent diseases in Maxakali people. The Kato-Katz is the diagnostic method recommended by WHO for epidemiological studies; however, one of the technique’s limitations is the failure to detect parasites in individuals with low parasite load. The aim of this study was to establish the prevalence of Schistosoma mansoni in indigenous Maxakali villages, evaluating the TF-Test® performance for diagnosis compared to the Kato-Katz technique. Stool samples from 545 individuals were processed by the TF-Test® (1 sample) and Kato-Katz (1 slide). The positivity rate for S. mansoni by Kato-Katz was 45.7%. The rate by the TF-Test® was 33.2%, and 51.9% by the combined parasitological techniques. The amplitude of parasite load was 24 to 4,056 eggs per gram of feces (epg), with a geometric mean of 139 epg. The co-positivity, co-negativity, and accuracy values by TF-Test® in relation to Kato-Katz were 59.0%, 88.5%, and 75.0%, respectively. The agreement between these techniques was moderate (k=0.486) as determined by the kappa index. Thus, the results of this study demonstrated that the performance of Kato-Katz was superior (p <0.05) to that of TF-Test® in the detection of S. mansoni. The combination of TF-Test® and Kato-Katz resulted in an increased positivity rate of S. mansoni, demonstrating the high risk of infection to which indigenous populations are exposed and the importance of the implementation of control strategies in Maxakali villages.
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Keywords in Portuguese
Região Sudeste, Minas Gerais, Doenças Infecciosas e Parasitárias, Maxakali
Keywords
Schistosomiasis, Parasitological techniques, Helminthes, Indigenous populations, Prevalence
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DeCS
Brasil, Índios Sul-Americanos, Saúde de Populações Indígenas, Epidemiologia, Estudos Epidemiológicos, Esquistossomose mansoni, Doenças Parasitárias
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NACIFE, Maria Beatriz Pena e Silva Leite et al. Prevalence of schistosomiasis mansoni in indigenous Maxakali villages, Minas Gerais, Brazil. Revista do Instituto de Medicina Tropical de São Paulo, v. 60, n. e26, p. 1-7, 2018.
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1678-9946
DOI
10.1590/S1678-9946201860026
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