Validación del proceso de obtención de datos para un estudio sobre trypanosomiasis americana en el estado de Morelos, México / Validation of data colection process for an american trypanosomiasis epidemiological study in the state of Morelos, México

RESUMO

The purpose of this paper is to show up the importance of the standardization concepts in american trypanosomiasis epidemiological studies. The consistence in the measurement of some dwelling characteristics was evaluated. A validation of the queretaro antigen for indirect hemagglutination reaction as a diagnostic test and the interobserver concordance for the serologic readings were also made. The observers were instructed in some sessions. The pretests were made in the laboratory with positive and negative sera, with sera from the studied population. Results show that the interobserver concordance after the instruction, for the dwelling variables ranged from 70 percent to 100 percent. Sensitivity of the queretaro antigen was 100 percent, specificity 55 percent, the predictive value of a positive test 55 percent, and the predictive value of a negative test 93 percent. The interobserver concordance was 47 percent. The pretest and the pilot study are very important in getting the objetives of the principal study