title: Prevalence and spatial distribution of intestinal parasitic infections in a rural Amazonian settlement, Acre State, Brazil.
abstract: A population-based survey of the prevalence and spatial distribution of intestinal parasitism was carried out in an agricultural settlement in the Amazon Basin of Brazil (Granada, Acre State). More than half (53.4%) of the 429 stool specimens from subjects in all age groups, living in 113 households, had cysts, ova, or larvae of intestinal parasites. The most prevalent parasites were Giardia duodenalis (19.6%) and soil-transmitted helminths (12.7%); 105 (24.5%) subjects were infected with more than one species of parasite. Significant age-related differences in prevalence were only found for G. duodenalis (children < 1 year and adults > 30 years were less affected). Six households (5.3%), situated within a radius of 690m, comprised 48.1% of all subjects harboring soil-transmitted helminths in our study area. Households within this cluster were poorer and more crowded than those outside the cluster. The observed spatial clustering of infections with soil-transmitted helminths provides valuable information for the spatial targeting of sanitary interventions in this area.
authors.affiliation: Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, São Paulo, Brasil.
authors.forename: Estéfano Alves
authors.initials: EA
authors.lastname: de Souza
authors.forename: Mônica
authors.initials: M
authors.lastname: da Silva-Nunes
authors.forename: Rosely Dos Santos
authors.initials: Rdos S
authors.lastname: Malafronte
authors.forename: Pascoal Torres
authors.initials: PT
authors.lastname: Muniz
authors.forename: Marly Augusto
authors.initials: MA
authors.lastname: Cardoso
authors.forename: Marcelo Urbano
authors.initials: MU
authors.lastname: Ferreira
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D001938:Brazil / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D004812:Epidemiologic Methods; D005872:Giardia / Q000469:parasitology*; D006798:Housing / Q000706:statistics & numerical data; D006801:Humans; D007223:Infant; D007411:Intestinal Diseases, Parasitic / Q000453:epidemiology*; D008875:Middle Aged; D011203:Poverty; D012111:Residence Characteristics; D012424:Rural Population / Q000706:statistics & numerical data