title: [Intestinal parasite infections in a semiarid area of Northeast Brazil: preliminary findings differ from expected prevalence rates].
abstract: We report on intestinal parasite infection prevalence in a population sample from S o Raimundo Nonato, Southeast Piau  State, Brazil, aimed at comparison with previous studies on Trichuris trichiura and Ascaris lumbricoides infection. A total of 265 stool specimens were collected and examined by spontaneous sedimentation. Approximately 57% of specimens were infected with at least one parasite species. Entamoeba coli (35.8%), Endolimax nana (13.6%), Hymenolepis nana (9.4%), and hookworm (9.4%) were the most frequently observed parasites. Two cases of roundworm infection were detected, probably acquired outside the region. T. trichiura eggs were not found. Interestingly, neither A. lumbricoides nor T. trichiura has been found in local prehistoric human coprolites. Nevertheless, hookworm infection has been present in the region for at least 7,000 years.
authors.affiliation: Universidade do Estado do Piauí, São Raimundo Nonato, PI, 64770-000, Brasil.
authors.forename: Jair Rodrigues
authors.initials: JR
authors.lastname: Alves
authors.forename: Heloísa Werneck
authors.initials: HW
authors.lastname: Macedo
authors.forename: Alberto Novaes
authors.initials: AN
authors.lastname: Ramos
authors.forename: Luiz Fernando
authors.initials: LF
authors.lastname: Ferreira
authors.forename: Marcelo Luiz Carvalho
authors.initials: ML
authors.lastname: Gonçalves
authors.forename: Adauto
authors.initials: A
authors.lastname: Araújo
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D001196:Ascariasis / Q000453:epidemiology; D017164:Ascaris lumbricoides / Q000302:isolation & purification; D001938:Brazil / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007411:Intestinal Diseases, Parasitic / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D014257:Trichuriasis / Q000453:epidemiology