Accuracy of yellow fever case definition of epidemiologic surveillance, São Paulo, 2018.

Rev Saude Publica

Secretaria de Estado da Saúde de São Paulo. Instituto de Infectologia Emílio Ribas. São Paulo, SP, Brasil.

Published: August 2023

AI Article Synopsis

  • The study aimed to evaluate the effectiveness of current yellow fever suspected case definitions from the Brazilian Ministry of Health and WHO, while proposing improved definitions based on actual cases.
  • Using logistic regression on past data from a specific health institute, the research identified characteristics that could better define a suspected case of yellow fever.
  • The findings indicated that the existing definitions were not very sensitive and suggested a new definition that significantly improved accuracy and sensitivity, indicating the potential for better identification of yellow fever cases.

Article Abstract

Objective: To evaluate the accuracy of yellow fever (YF) suspected case definitions from the Brazilian Ministry of Health (BMH) and World Health Organization (WHO), as well as propose and evaluate new definitions of suspected cases, considering confirmed and discarded cases.

Methods: The retrospective study was conducted at the Instituto de Infectologia Emílio Ribas (IIER), using the Epidemiologic Surveillance Form of YF cases. From the confirmed and discarded cases of YF, a logistic regression model was developed. The independent variables were used in a proposed definition of a suspected case of YF and its accuracy was evaluated.

Results: In total, 113 YF suspect cases were reported, with 78 confirmed (69.0%). The definitions by BMH and WHO presented low sensitivity, 59% and 53.8%, and reduced accuracy, 53.1% and 47.8%, respectively. Predictive factors for YF were thrombocytopenia, leukopenia, and elevation of transaminases greater than twice normal. The definition including individual with acute onset of fever, followed by elevation of ALT or AST greater than twice the reference value AND leukopenia OR thrombocytopenia presented high sensitivity (88.3%), specificity (62.9%), and the best accuracy (80.4%), as proposed in the model.

Conclusion: The YF suspected case definitions of the BMH and the WHO have low sensitivity. The inclusion of nonspecific laboratory tests increases the accuracy of YF definition.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10355313PMC
http://dx.doi.org/10.11606/s1518-8787.2023057005001DOI Listing

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