The direct agglutination test as an alternative method for the diagnosis of canine and human visceral leishmaniasis

Guillermo Terán-Angel, Henk Schallig, Olga Zerpa, Vestalia Rodríguez, Marian Ulrich, Maira Cabrera, .

Keywords: Leishmaniasis, visceral/diagnosis, agglutination tests, Leishmania donovani, humans, dogs, Venezuela

Abstract

Introduction. Visceral leishmaniasis is the most severe clinical form of leishmaniasis and is often fatal without proper treatment. Therefore, early and accurate diagnosis is important, but
often difficult in endemic areas.
Objective. The aim was to evaluate a direct agglutination test as a potential visceral leishmaniasis diagnostic method in endemic areas of Venezuela.
Materials and methods. The performance of the direct agglutination test, based on freezedried Leishmania donovani antigen was evaluated under laboratory conditions using serum samples of humans and dogs from several Venezuelan visceral leishmaniasis endemic areas: Nueva Esparta (Margarita Island), Lara, Anzoátegui and Trujillo Status. The study included confirmed visceral leishmaniasis patients (n=30), visceral leishmaniasis suspected subjects (n=4), healthy controls (n=19) and patients with other confirmed diseases (n=20). In addition, 24 serum samples from dogs with confirmed visceral leishmaniasis and 18 healthy control dogs were tested.
Results. All serum samples of visceral leishmaniasis patients, either active or recovered, were positive. They showed anti-L. donovani titers above 1:1600. Three out of four suspected visceral leishmaniasis cases were also positive, while serum samples from endemic controls and patients with other diseases had titers lower than 1:800. A sensitivity of 100% was obtained for all threshold levels under consideration and 100% specificity at the threshold titer of 1:800 (95% confidence interval: 91-100%). A 93% sensitivity (95% confidence interval: 76-99%) was observed in dog samples, with 100% specificity (95% confidence interval: 79-100%) at the threshold titer of 1:200.
Conclusion. The direct agglutination test seems suitable for use in epidemiological studies and for serological diagnosis of human visceral leishmaniasis and canine visceral leishmaniasis.

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  • Guillermo Terán-Angel Instituto de Biomedicina, Universidad Central de Venezuela, San José, Caracas, Venezuela
  • Henk Schallig KIT (Koninklijk Instituut voor de Tropen / Royal Tropical Institute), Biomedical Research, Amsterdam, Netherlands
  • Olga Zerpa Instituto de Biomedicina, Universidad Central de Venezuela, San José, Caracas, Venezuela
  • Vestalia Rodríguez Instituto de Biomedicina, Universidad Central de Venezuela, San José, Caracas, Venezuela
  • Marian Ulrich Instituto de Biomedicina, Universidad Central de Venezuela, San José, Caracas, Venezuela
  • Maira Cabrera Instituto de Biomedicina, Universidad Central de Venezuela, San José, Caracas, Venezuela

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How to Cite
1.
Terán-Angel G, Schallig H, Zerpa O, Rodríguez V, Ulrich M, Cabrera M. The direct agglutination test as an alternative method for the diagnosis of canine and human visceral leishmaniasis. biomedica [Internet]. 2007 Sep. 1 [cited 2024 May 17];27(3):447-53. Available from: https://revistabiomedica.org/index.php/biomedica/article/view/207

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