2005, Number 4
Intestinal parasitosis in schoolchildren: relationship between its prevalence in stool and in the subungueal area.
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ABSTRACTIntroduction. Intestinal parasites are frequently transmitted by water and/or food ingestion contaminated with infective organisms. The role of subungueal deposits as disseminators of enteropatogens in people with deficient hygienic habits has been discussed.
Objective. To determine the prevalence of intestinal parasites in stool and in subungueal deposits in schoolchildren from the U.E.E. Teresa de la Parra, Buen Retiro neighborhood, San Félix, Bolívar State in Venezuela.
Material and methods. A cross-sectional study was carried out from May to July 2003 on 195 children of both sexes, aged 6-15 years. A stool sample was obtained from each child and analyzed by the direct examination technique and by the Willis and formol-ether concentration methods. Samples of nails and deposit under nails were also collected and processed by the formol-ether method.
Results. The prevalence of parasites in stool was 97.4% (335/344). The parasitosis did not show age (χ2 = 6.2; f.d. = 4) or sex (p › 0.05) preferences. Protozoans were more frequent than helminthes. The more common protozoan was Blastocystis hominis with 76.2%. The most common helminth was Trichuris trichiura with 74.1%. The parasitic stages prevalence in subungueal deposits was 3.6% (11/307), A. lumbricoides and E. coli being the most frequent. There was no relationship between the parasite presence in stool and in the subungueal deposits.
Conclusion. A high prevalence of intestinal parasitosis in the school children evaluated was observed. Although the importance of subungueal deposits as disseminators of enteroparasites was demonstrated, this mechanism does not appear to be the major factor implicated in the epidemiological chain of parasitosis in these children.
32.- Piña E, Muñoz J, Requena CI, León M, Devera R, Velásquez V, et al. Prevalencia de parasitosis intestinales en escolares de la Unidad Educativa “Juan Vicente Cardoso”, San Félix. Estado Bolívar, Venezuela. Memorias XVI Jornadas Científicas, Tecnológicas y Educativas de Guayana. 2-4 de noviembre de 2000. Ciudad Bolívar, Venezuela. 2000. p. 78-79.
48.- Cancio CR, Dacai AR, Wanderley FS, Soares VL, Calheiros CM. Ocorrência de helmintoses e protozoozes em amostras fecais e de residuos do leito subungueal de crianças em favelas do municipio de Marechal Deodoro, Alagaos. Brasil. Memorias del XV Congresso de Parasitologia. Poços de Caldas, Brasil. 1999. p. 183.