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MALARIAL AND INTESTINAL PARASITIC CO-INFECTIONS IN INDIGENOUS POPULATIONS OF THE BRAZILIAN AMAZON RAINFOREST
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Centro de Medicina Tropical de Rondônia - CEMETRON. Porto Velho, Rondônia, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Imunoparasitologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Imunoparasitologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Hepatites Virais. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Hepatites Virais. Rio de Janeiro, RJ, Brasil.
Laboratório de Análises Clínica do Distrito Sanitário Indígena Yanomami - DSEI-Y, Boa Vista, Roraima, Brasil.
Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Pesquisa em Malária. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Coleção de Simulídeos do Instituto Oswaldo Cruz. Laboratório de Referência Nacional em Simulídeos, Oncocercose e Mansonelose. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Imunoparasitologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Imunoparasitologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Hepatites Virais. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Hepatites Virais. Rio de Janeiro, RJ, Brasil.
Laboratório de Análises Clínica do Distrito Sanitário Indígena Yanomami - DSEI-Y, Boa Vista, Roraima, Brasil.
Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Pesquisa em Malária. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Coleção de Simulídeos do Instituto Oswaldo Cruz. Laboratório de Referência Nacional em Simulídeos, Oncocercose e Mansonelose. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Imunoparasitologia. Rio de Janeiro, RJ, Brasil.
Abstract
The Brazilian Amazon rainforest region has a significant prevalence of malarial and intestinal parasitic
infections in indigenous populations, accounting for a disproportionate burden. Thus, a cross-sectional
study was conducted to assess the prevalence and association between malarial and intestinal protozoan
and helminth infections in four remote indigenous villages in the Brazilian Amazon Forest. A total of 430
individuals participated in the study, and Plasmodium infections were diagnosed by examination of thick
blood smears and PCR. Stool samples 295 individuals (69%) were examined by direct smear and the
Kato–Katz technique. The overall prevalence of malaria, intestinal protozoan infection, and intestinal helminth
infection was 14.2%, 100%, and 39.3%, respectively. Polyparasitism was predominant (83.7%), and
most infected individuals had at least two or more different species of intestinal protozoan and/or helminth
parasites. The prevalence of co-infection was 49.5%, and in individuals with intestinal protozoa and helminth
infections (34%), Entamoeba. coli, Entamoeba histolytica, and Ascaris lumbricoides were the most
common parasites. In individuals with malaria and protozoa infections (10.2%), P. vivax, E. coli, and E. histolytica
predominated, and in individuals with malaria, protozoa, and helminth infections (5.4%). P. vivax, E.
coli, E. histolytica, and A. lumbricoides predominated. Intestinal polyparasitism was common in the study
population, and the presence of helminths was associated with an increased number of intestinal parasitic
species. However, Plasmodium infections were neither a risk nor a protective factor for helminth infections;
the same was true for helminth infections in relation to Plasmodium. The high prevalence of intestinal
polyparasitism with Plasmodium co-infections highlights the need for combining strategies that may help
control both malaria and intestinal parasite and generate a health approach aligned with indigenous perspectives.
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