Parasites, Hosts and Diseases

The Korea Society for Parasitology and Tropical Medicine (대한기생충학·열대의학회)
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Prevalence and Comparison of Diagnostic Methods for Trichomonas vaginalis Infection in Pregnant Women in Argentina

  • Perazzi, Beatriz E. (Clinical Bacteriology Laboratory, Department of Clinical Biochemistry, Hospital de Clinicas, Faculty of Pharmacy and Biochemistry, University of Buenos Aires) ;
  • Menghi, Claudia I. (Parasitology Laboratory, Department of Clinical Biochemistry, Hospital de Clinicas, Faculty of Pharmacy and Biochemistry, University of Buenos Aires) ;
  • Coppolillo, Enrique F. (Lower Genital Tract Clinic, Obstetrics Division, Department of Tocogynecology, Hospital de Clinicas, University Hospital of Buenos Aires) ;
  • Gatta, Claudia (Parasitology Laboratory, Department of Clinical Biochemistry, Hospital de Clinicas, Faculty of Pharmacy and Biochemistry, University of Buenos Aires) ;
  • Eliseth, Martha Cora (Lower Genital Tract Clinic, Obstetrics Division, Department of Tocogynecology, Hospital de Clinicas, University Hospital of Buenos Aires) ;
  • De Torres, Ramon A. (Specialization Course in Clinical Bacteriology, Faculty of Pharmacy and Biochemistry, University of Buenos Aires) ;
  • Vay, Carlos A. (Clinical Bacteriology Laboratory, Department of Clinical Biochemistry, Hospital de Clinicas, Faculty of Pharmacy and Biochemistry, University of Buenos Aires) ;
  • Famiglietti, Angela M. R. (Clinical Bacteriology Laboratory, Department of Clinical Biochemistry, Hospital de Clinicas, Faculty of Pharmacy and Biochemistry, University of Buenos Aires)
  • Received : 2009.10.12
  • Accepted : 2010.01.18
  • Published : 2010.03.15
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Abstract

The objectives of this study were to conduct a prevalence survey of trichomoniasis in pregnant women and to evaluate the utility of different methods for its diagnosis. A total of 597 vaginal exudates from pregnant women who were examined at the Hospital de Clinicas in Buenos Aires, Argentina from 1 August 2005 to 31 January 2007, were prospectively and consecutively evaluated. The investigation of Trichomonas vaginalis was made by different microscopic examinations, and culture on liquid medium. The sensitivity and specificity of the microscopic examinations were assessed considering culture on liquid medium as the "gold standard". The prevalence of T. vaginalis obtained by culture on liquid medium was 4.0% (24/597). The prevalence of T. vaginalis obtained by direct wet smear, prolonged May-Grunwald Giemsa staining, and sodium acetate-formalin (SAF)/methylene blue staining-fixing technique was 1.8%, 2.3% and 2.5%, respectively. The sensitivity of the direct wet smear was 45.8%, that of the prolonged May-Grunwald Giemsa staining was 58.3%, and that of the SAF/methylene blue method was 62.5%. Considering the 3 microscopic examinations altogether, the sensitivity rose to 66.7% and the specificity was 100% for all of them. This is the first time that the prevalence data of T. vaginalis by culture in pregnant women are published in Argentina. Due to the low sensitivity obtained by microscopy in asymptomatic pregnant women, the use of the liquid medium is recommended during pregnancy, in order to provide an early diagnosis and treatment.

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References

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