Evaluation of parasitological and molecular techniques for the diagnosis and assessment of cure of schistosomiasis mansoni in a low transmission area

Memórias do Instituto Oswaldo Cruz

Liliane Maria Vidal Siqueira¹  Luciana Inácia Gomes¹  Edward Oliveira¹  Eduardo Ribeiro De Oliveira¹  Áureo Almeida De Oliveira¹  Martin Johannes Enk¹  Nídia Figueiredo Carneiro¹  Ana Rabello¹  Paulo Marcos Zech Coelho¹ 

关键词: Schistosoma mansoni;    schistosomiasis;    diagnosis;    control;    low transmission area;    Brazil;   

DOI  :  10.1590/0074-02760140375

来源: SciELO

【 摘 要 】

This study evaluated parasitological and molecular techniques for the diagnosis and assessment of cure of schistosomiasis mansoni. A population-based study was performed in 201 inhabitants from a low transmission locality named Pedra Preta, municipality of Montes Claros, state of Minas Gerais, Brazil. Four stool samples were analysed using two techniques, the Kato-Katz® (KK) technique (18 slides) and the TF-Test®, to establish the infection rate. The positivity rate of 18 KK slides of four stool samples was 28.9% (58/201) and the combined parasitological techniques (KK+TF-Test®) produced a 35.8% positivity rate (72/201). Furthermore, a polymerase chain reaction (PCR)-ELISA assay produced a positivity rate of 23.4% (47/201) using the first sample. All 72 patients with positive parasitological exams were treated with a single dose of Praziquantel® and these patients were followed-up 30, 90 and 180 days after treatment to establish the cure rate. Cure rates obtained by the analysis of 12 KK slides were 100%, 100% and 98.4% at 30, 90 and 180 days after treatment, respectively. PCR-ELISA revealed cure rates of 98.5%, 95.5% and 96.5%, respectively. The diagnostic and assessment of cure for schistosomiasis may require an increased number of KK slides or a test with higher sensitivity, such as PCR-ELISA, in situations of very low parasite load, such as after therapeutic interventions.

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