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Am. J. Trop. Med. Hyg., 55(1), 1996, pp. 32-38
Copyright © 1996 by The American Society of Tropical Medicine and Hygiene

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Hypoendemic Malaria in Rondonia (Brazil, Western Amazon Region): Seasonal Variation and Risk Groups in an Urban Locality

Luis Marcelo Aranha Camargo, Gloria Maria Duccini Dal Colletto, Marcelo Urbano Ferreira, Sergio De Mello Gurgel, Ana Lucia Escobar, Agostinho Marques, Henrique Krieger, Erney Plessmann Camargo AND Luiz Hildebrando Pereira Da Silva
Departmento de Parasitologia, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, Brazil; Unite de Parasitologie Experimentale, Institute Pasteur, Paris, France; Universidade de Rondonia, Porto Velho, Brazil; Fundacao Nacional de Saude Brasilia, Brazil

A longitudinal epidemiologic survey (1989–1991) plus a cross-sectional parasitologic, clinical, and sociodemographic survey (July–October 1990) were conducted in Candeias do Jamary, a village with approximately 7,000 inhabitants in Rondonia, Brazil. Analysis of the results revealed hypoendemic malaria with a complex epidemiology. Plasmodium vivax predominated over P. falciparum infections while infections with P. malariae were absent. Malaria is present throughout the year but was clearly seasonal with epidemic outbreaks in the dry season from June to August. Malaria prevalence was lower in children less than 10 years of age and significantly higher in young adult males, which represent the high-risk group. The incidence of locally acquired infections (autochthonous cases) was significantly lower in the rainy season as compared with the dry season. This is not true with respect to heterotochthonous (imported) malaria cases, that is, malaria acquired elsewhere by Candeias residents, most of whom are male adults working outside the town. In both cases, however, the age and sex distribution of prevalence and its relationship with occupational activities indicate a predominance of outdoor transmission. The results of the cross-sectional survey are in agreement with those of the longitudinal passive survey and, in addition, disclose the absence of asymptomatic infection.




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B. H. SINGER and M. C. DE CASTRO
Agricultural Colonization and Malaria on the Amazon Frontier
Ann. N.Y. Acad. Sci., December 1, 2001; 954(1): 184 - 222.
[Abstract] [Full Text] [PDF]


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Copyright © 1996 by the American Society of Tropical Medicine and Hygiene.