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Revista Latinoamericana de Microbiología

2003, Number 1-2

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Microbiología 2003; 45 (1-2)

Blastocystis hominis among food vendors in Xochimilco markets

Cruz LV, Plancarte CA, Morán ÁC, Valencia RS, Rodríguez SG, Vega FL

Language: English
References: 20
Page: 12-15
PDF size: 53.52 Kb.


ABSTRACT

Blastocystis hominis is a pathogenic protozoon that lives in the human bowel and causes diarrhea: the mode of transmission is a passive one, through the ingestion of stool-contaminated water or foods that contain infective forms of the parasite. The purpose of this study is to report the prevalence of Blastocystis hominis among food vendors in the markets within the Xochimilco jurisdiction, Mexico City, Mexico. A cross-sectional study was conducted in which food vendors answered an epidemiological questionnaire and underwent a serial stool culture. The frequency of the intestinal parasitoses reported was estimated and an analysis was carried out associating the presence of Blastocystis hominis with socio-economic and hygienic factors using the odds ratio at a 95% confidence interval. The frequency of intestinal parasites and commensals was 50.4%; Blastocystis hominis was found in 48 (41.7%) food vendors. The risk analysis showed that Blastocystis hominis was associated with: male gender, poor personal hygiene habits, personal history of parasitosis, and family history of parasitosis. The prevalence reported is high when compared with other populations studied. The relevance of this report lies on the fact that food vendors handle foods and could transmit the infection to consumers.


REFERENCES

  1. Boreham, P. & D. Stenzel. 1993. Blastocystis in human and animals: morphology, biology, and epizootiology. Adv Parasitol. 32:1-70.

  2. Stenzel, D.J. & F.L. Boreham. 1996. Blastocystis hominis revisited. Clin. Microbiol. Rev. 9:563-584.

  3. Koutsavlis, A.T., L. Valiquette, R. Allard & J. Soto. 2001. Blastocystis hominis: a new pathogen in day-care centers? Can. Commun. Dis. Rep. 27:76-84.

  4. Gericke, A.S., G.D. Burchard, J. Knobloch & B. Walderich. 1997. Isoenzyme patterns of Blastocystis hominis patient isolates derived from symptomatic and healthy carriers. Trop. Med. Inter. Health 2:245-253.

  5. Boreham, R., S. Benson, D. Stenzel & P. Boreham. 1996. Blastocystis hominis infection. Lancet 348 (27):272-273.

  6. Rivero, Z., G. Chourio, I. Diaz, R. Cheng & G. Rucsón. 2000. Enteroparásitos en escolares de una institución pública del municipio Maracaibo, Venezuela. Invest. Clin. 41:37-57.

  7. Devera, R.A., G. Niebla, V.J. Velásquez, J.A. Nastasi & R. González. 1997. Prevalencia de infección por Blastocystis hominis en escolares de Ciudad Bolívar, Venezuela. Bol. Chil. Parasitol. 52: 77-81.

  8. Devera, R.A., B. Azacon & M. Jiménez. 1998. Blastocystis hominis en pacientes del hospital universitario “Ruiz y Páez” de ciudad Bolivar, Venezuela. Bol. Chil. Parasitol. 53:65-70.

  9. Álvarez, R., L. Siqueiros & C. De la Cruz. 1995. Frecuencia de Blastocystis hominis en niños atendidos en el Instituto Nacional de Pediatría. Rev. Mex. Patol. Clin. 42:26-30.

  10. Ritchie, L.S. 1948. An ether sedimentation technique for routine stool examinations. Bull. US Army Med. Dept. 8:326.

  11. Epi Info versión 6.04. WHO/CDC, 1997.

  12. Daniel W. Bioestadística. Base para el análisis de las ciencias de la salud. Ed. Limusa Wiley, México. 2002:755.

  13. Moe, K.T., M. Singh, P. Gopalakrishnakone, L.C. Ho, S.W. Tan, X.Q. Chen & E.H. Yap. 1998. Cytopathic effect of Blastocystis hominis after intramuscular inoculation into laboratory mice. Parasitol. Res. 84:450-454.

  14. Walderich, B., S. Bernauer, M. Renner, J. Knobloch & G.D. Burchard. 1998. Cytopathic effects of Blastocystis hominis on Chinese hamster ovary (CHO) and adenocarcinoma HT29 cell cultures. Trop. Med. Inter. Health 3:385-390.

  15. Lanuza, M.D., J.A. Carvajal, J. Villar, A. Mir & R. Borrás. 1999. Soluble-protein and antigenic heterogeneity in axenic Blastocystis hominis isolates: pathogenic implications. Parasitol Res 85:93-97.

  16. Ashford, R.W. & E.A. Atkinson. 1992. Epidemiology of Blastocystis hominis infection in Papua New Guinea: age-prevalence and associations with other parasites. Ann. Trop. Med. Parasitol. 86:129-136.

  17. Cirioni, O., A. Giacometti, D. Drenaggi, F. Ancarani & G. Scalise. 1999. Prevalence and clinical relevance of Blastocystis hominis in diverse patient cohorts. Eur. J. Epidemiol. 15:389-393.

  18. Singh, M., K. Suresh, L.C. Ho, G.C. Ng & E.H. Yap. 1995. Elucidation of the life cycle of the intestinal protozoan Blastocystis hominis. Parasitol. Res. 81: 446-450.

  19. Moe, K.T., M. Singh, J. Howe, L.C. Ho, S.W. Tan, G.C. Ng, X.Q. Chen & E.H. Yap. 1996. Observations on the ultrastucture and viability of the cystic stage of Blastocystis hominis from human feces. Parasitol. Res. 82:439-444.

  20. Rajah, H.S., G.K. Suresh, S. Vellayan, J.W. Mak, A.A. Khairul, I. Init, G.D. Vennila, R. Saminathan & K. Ramakrishnan. 1999. Blastocystis in animal handlers. Parasitol. Res. 85:1032-1033.




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