Performance of six diagnostic tests to screen for Chagas disease in blood banks and prevalence of Trypanosoma cruzi infection among donors with inconclusive serology screening based on the analysis of epidemiological variables
Rev. bras. hematol. hemoter
;
34(4): 292-297, 2012. tab
Artigo
em Inglês
| LILACS
| ID: lil-648529
ABSTRACT
OBJECTIVE: The frequent occurrence of inconclusive serology in blood banks and the absence of a gold standard test for Chagas'disease led us to examine the efficacy of the blood culture test and five commercial tests (ELISA, IIF, HAI, c-ELISA, rec-ELISA) used in screening blood donors for Chagas disease, as well as to investigate the prevalence of Trypanosoma cruzi infection among donors with inconclusive serology screening in respect to some epidemiological variables. METHODS: To obtain estimates of interest we considered a Bayesian latent class model with inclusion of covariates from the logit link. RESULTS: A better performance was observed with some categories of epidemiological variables. In addition, all pairs of tests (excluding the blood culture test) presented as good alternatives for both screening (sensitivity > 99.96% in parallel testing) and for confirmation (specificity > 99.93% in serial testing) of Chagas disease. The prevalence of 13.30% observed in the stratum of donors with inconclusive serology, means that probably most of these are non-reactive serology. In addition, depending on the level of specific epidemiological variables, the absence of infection can be predicted with a probability of 100% in this group from the pairs of tests using parallel testing. CONCLUSION: The epidemiological variables can lead to improved test results and thus assist in the clarification of inconclusive serology screening results. Moreover, all combinations of pairs using the five commercial tests are good alternatives to confirm results.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Doadores de Sangue
/
Fatores Epidemiológicos
/
Sensibilidade e Especificidade
/
Doença de Chagas
Tipo de estudo:
Estudo diagnóstico
/
Estudo de prevalência
/
Estudo prognóstico
/
Fatores de risco
/
Estudo de rastreamento
Limite:
Feminino
/
Humanos
/
Masculino
Idioma:
Inglês
Revista:
Rev. bras. hematol. hemoter
Assunto da revista:
Hematologia
Ano de publicação:
2012
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Universidade Federal do Triângulo Mineiro/BR
/
Universidade de São Paulo/BR
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