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A comparative study of the TF-Test®, Kato-Katz, Hoffman-Pons-Janer, Willis and Baermann-Moraes coprologic methods for the detection of human parasitosis
Carvalho, Gabriela Lanna Xavier de; Moreira, Luciano Evangelista; Pena, João Luiz; Marinho, Carolina Coimbra; Bahia, Maria Terezinha; Machado-Coelho, George Luiz Lins.
  • Carvalho, Gabriela Lanna Xavier de; Universidade Federal de Ouro Preto. Ouro Preto. BR
  • Moreira, Luciano Evangelista; Universidade do Vale do Rio Doce. BR
  • Pena, João Luiz; Universidade Federal de Minas Gerais. Departamento de Saneamento. Belo Horizonte. BR
  • Marinho, Carolina Coimbra; Universidade Federal de Ouro Preto. Departamento de Ciências Médicas. Ouro Preto. BR
  • Bahia, Maria Terezinha; Universidade Federal de Ouro Preto. Ouro Preto. BR
  • Machado-Coelho, George Luiz Lins; Universidade Federal de Ouro Preto. Ouro Preto. BR
Mem. Inst. Oswaldo Cruz ; 107(1): 80-84, Feb. 2012. ilus, graf
Article in English | LILACS | ID: lil-612809
ABSTRACT
This study compares the diagnostic accuracy of the TF-Test® (TFT) for human parasitosis with results obtained using the traditional Kato-Katz (KK), Hoffman-Pons-Janer (HPJ), Willis and Baermann-Moraes (BM) techniques. Overall, four stool samples were taken from each individual; three alternate-day TFT stool samples and another sample that was collected in a universal container. Stool samples were taken from 331 inhabitants of the community of Quilombola Santa Cruz. The gold standard (GS) for protozoa detection was defined as the combined results for TFT, HPJ and Willis coproscopic techniques; for helminth detection, GS was defined as the combined results for all five coproscopic techniques (TFT, KK, HPJ, Willis and BM). The positivity rate of each method was compared using the McNemar test. While the TFT exhibited similar positivity rates to the GS for Entamoeba histolytica/dispar (82.4 percent) and Giardia duodenalis (90 percent), HPJ and Willis techniques exhibited significantly lower positivity rates for these protozoa. All tests exhibited significantly lower positivity rates compared with GS for the diagnosis of helminths. The KK technique had the highest positivity rate for diagnosing Schistosoma mansoni (74.6 percent), while the TFT had the highest positivity rates for Ascaris lumbricoides (58.1 percent) and hookworm (75 percent); HPJ technique had the highest positivity rate for Strongyloides stercoralis (50 percent). Although a combination of tests is the most accurate method for the diagnosis of enteral parasites, the TFT reliably estimates the prevalence of protozoa and selected helminths, such as A. lumbricoides and hookworm. Further studies are needed to evaluate the detection accuracy of the TFT in samples with varying numbers of parasites.
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Full text: Available Index: LILACS (Americas) Main subject: Protozoan Infections / Feces / Helminthiasis / Intestinal Diseases, Parasitic Type of study: Diagnostic study / Risk factors Limits: Animals / Humans Country/Region as subject: South America / Brazil Language: English Journal: Mem. Inst. Oswaldo Cruz Journal subject: Tropical Medicine / Parasitology Year: 2012 Type: Article / Project document Affiliation country: Brazil Institution/Affiliation country: Universidade Federal de Minas Gerais/BR / Universidade Federal de Ouro Preto/BR / Universidade do Vale do Rio Doce/BR

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Full text: Available Index: LILACS (Americas) Main subject: Protozoan Infections / Feces / Helminthiasis / Intestinal Diseases, Parasitic Type of study: Diagnostic study / Risk factors Limits: Animals / Humans Country/Region as subject: South America / Brazil Language: English Journal: Mem. Inst. Oswaldo Cruz Journal subject: Tropical Medicine / Parasitology Year: 2012 Type: Article / Project document Affiliation country: Brazil Institution/Affiliation country: Universidade Federal de Minas Gerais/BR / Universidade Federal de Ouro Preto/BR / Universidade do Vale do Rio Doce/BR