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Aspects related to positivity for schistosomiasis: a cross-sectional study in a low prevalence area in Alagoas, Brazil, 2020* * Article derived from the Doctoral thesis entitled 'Epidemiology of schistosomiasis mansoni in a low prevalence area in the state of Alagoas', to be submitted by Israel Gomes de Amorim Santos to the Biosciences and Biotechnology in Health Postgraduate Program, Biosciences and Biotechnology in Health Course, Instituto Aggeu Magalhães, Fundação Instituto Oswaldo Cruz, Pernambuco. The study received financial support from the Alagoas State Research Support Foundation (FAPEAL) and the Ministry of Health: Process No. 60030.000857/2016.

Abstract

Objective:

To analyze aspects related to schistosomiasis positivity in an area of low prevalence in Brazil.

Methods:

This was a cross-sectional study, carried out in the first half of 2020, where we analyzed the proportion of positivity, according to the number of Kato-Katz slides, the diagnostic performance of the test and positivity estimates based on data from the Schistosomiasis Surveillance and Control Program Information System (SISPCE).

Results:

2,088 slides from 348 individuals were analyzed, with proportion of positivity of 11.8%, 26.7% and 31.0% for 1, 4 and 6 slides analyzed, respectively. There was excellent agreement (Kappa = 0.91) between the readings of 4 and 6 slides. The SISPCE data was estimated to be underreported by up to 2.1 times.

Conclusion:

Increasing the number of slides increased Kato-Katz positivity, which can contribute to maximizing the control of the disease as a Public Health problem.

Keywords:
Neglected Diseases; Cross-Sectional Studies; Sensitivity and Specificity; Public Health; Schistosomiasis Mansoni; Parasitic Diseases

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