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• W179173632 abstract "Yellow fever is caused by the prototype virus of the genus Flavivirus and it is transmitted to humans through the bite of bloodsucking mosquitoes infected with the viral agent. The disease remains endemic in tropical forest regions from Africa and South America, despite the availability of effective vaccines against yellow fever virus - 17D-204 and 17DD - considered safe and highly immunogenic, capable of inducing a rapid specific immune response, with the formation of neutralizing antibodies that appear early, are protective and long lasting. The plaque reduction neutralization test (PRNT) is considered the most sensitive and most specific test for detection and quantification of neutralizing antibodies, and the reference method for assessing the protective immune response after vaccination. This study evaluated the reliability and accuracy of micro PRNT50 (applied in 96-well plates) with reference to the PRNT50 (applied in 6-well plates) and compared the performance of the micro PRNT50 with the micro PRNT90. Two-hundred serum samples from Brazilian individuals who participated in a clinical study of dose-response of 17DD vaccine produced in Bio-Manguinhos were selected. The repeatability was measured from three independent repetitions of the test for each of the 200 sera by a dual operator and the same procedure was performed by the other two dual operators, in order to determine the reproducibility of the micro PRNT50. The intraclass correlation coefficient (ICC) and Pearson correlation coefficient were determined. Accuracy measures determined in this study were sensitivity, specificity, overall accuracy, prevalence and positive predictive values (PPV) and negative (NPV). The ROC curve was also used to determine the best cut-off point of micro PRNT50. In the assessment of repeatability, ICCs for dual operators ranged from 0.62 to 0.76, and Pearson correlation coefficients were between 0.62 and 0.78. For reproducibility, the ICC obtained was 0.72 and the Pearson correlation coefficients ranged between 0.70 and 0.76. The best measures of accuracy were achieved considering the cut-off point for the micro PRNT50 of 2.9 log10mIU/mL, which had a sensitivity of 91.1%, specificity of 72.9% and overall accuracy of 78%. The best performance of micro PRNT50with this cut-off point was ratified by the ROC curve analysis. Considering a hypothetical scenario of an outbreak of YF, the prevalence would be 28%, with PPV of 56.7% and NPV of 95.5%. The micro PRNT50showed satisfactory levels of reliability and accuracy, however the micro PRNT90 showed higher performance with sensitivity of 100%, specificity of 94.7% and overall accuracy of 95%. Modifications in the test methodology and changes in the classification criteria in the readings of the results obtained will be important to improve the accuracy of micro PRNT." @default.
• W179173632 created "2016-06-24" @default.
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• W179173632 date "2011-01-01" @default.
• W179173632 modified "2023-10-11" @default.
• W179173632 title "Avaliação da acurácia e confiabilidade do teste sorológico de neutralização por redução de placas de lise (micro PRNT) na detecção de anticorpos para o vírus da Febre Amarela" @default.
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