Técnicas sorológicas e moleculares na avaliação da efetividade do tratamento contra Trypanosoma vivax em caprinos experimentalmente infectados
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Data
2017-02-02
Autores
Sampaio, Paulo Henrique [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Trypanosoma vivax é hemoparasita que infecta ruminantes e causa grandes perdas econômicas na pecuária, reduzindo os índices produtivos e reprodutivos dos animais. A principal alteração causada pelo parasita é anemia, podendo em alguns casos levar a sinais clínicos neurológicos e eventualmente levar o animal ao óbito. Os sinais clínicos são inespecíficos, fato que dificulta seu diagnóstico. O correto diagnóstico e tratamento são fundamentais para o efetivo controle da doença. Desta forma, o presente trabalho objetivou utilizar a LAMP, cPCR, RIFI e ELISA como ferramentas diagnósticas para verificar a cura parasitológica e soronegativação de caprinos experimentalmente infectados por T. vivax após o tratamento com o diaceturato de diminazeno (DM) ou cloridrato de isometamidium (ISM), além de avaliar as alterações histopatológicas do encéfalo para esclarecer melhor os mecanismos que levam a manifestações neurológicas. No presente trabalho detectamos anemia nos animais experimentalmente infectados por T. vivax e o parasita apresentou resistência a ambos os medicamentos, a qual foi comprovada por métodos sorológicos e moleculares. Também foram detectadas alterações na celularidade do neurópilo de animais infectados, o que pode resultar em danos aos neurônios e no desenvolvimento dos sinais clínicos neurológicos nos animais cronicamente infectados. Concluímos que o isolado testado no experimento foi resistente aos quimioterápicos testados, sendo a melhor forma de diagnóstico a associação dos métodos sorológicos e moleculares, e que T. vivax causa alteração da celularidade do neurópilo.
Trypanosoma vivax is a hemoparasite that infects ruminants and causes huge economic losses in livestock, reducing animals productive and reproductive indexes. The main alteration caused by this parasite is anemia and may eventually lead animal to death. The clinical signs are nonspecific which explains the correct diagnosis difficult. Correct diagnosis and treatment are essential for the effective control of this disease. Thus, the goals of this present work was use tools diagnostics molecular (LAMP and PCR) and serological (ELISA and IFAT) to verify the parasitological cure and seronegativation of goats experimentally infected with T. vivax after treatment with diminazene diaceturate (DM) or isometamidium hydrochloride (ISM), besides assess histological alterations in ruminants’ brains to elucidate the mechanism that cause neurologic disorders. In our study we detected anemia and, parasitic resistance to both drugs in animals experimentally infected with T. vivax, which was confirmed by serologic and molecular methods. Additionally, we detected alterations in neuropyl cells of infected animals, which may cause injuries in neuron and consequently neurologic signs in chronic infected animals. Therefore, we conclude that the tested T. vivax isolate was resistant to both drugs, being the best way of diagnosis is the association of serologic and molecular methods and T. vivax cause alterations in neuropyl cells.
Trypanosoma vivax is a hemoparasite that infects ruminants and causes huge economic losses in livestock, reducing animals productive and reproductive indexes. The main alteration caused by this parasite is anemia and may eventually lead animal to death. The clinical signs are nonspecific which explains the correct diagnosis difficult. Correct diagnosis and treatment are essential for the effective control of this disease. Thus, the goals of this present work was use tools diagnostics molecular (LAMP and PCR) and serological (ELISA and IFAT) to verify the parasitological cure and seronegativation of goats experimentally infected with T. vivax after treatment with diminazene diaceturate (DM) or isometamidium hydrochloride (ISM), besides assess histological alterations in ruminants’ brains to elucidate the mechanism that cause neurologic disorders. In our study we detected anemia and, parasitic resistance to both drugs in animals experimentally infected with T. vivax, which was confirmed by serologic and molecular methods. Additionally, we detected alterations in neuropyl cells of infected animals, which may cause injuries in neuron and consequently neurologic signs in chronic infected animals. Therefore, we conclude that the tested T. vivax isolate was resistant to both drugs, being the best way of diagnosis is the association of serologic and molecular methods and T. vivax cause alterations in neuropyl cells.
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Palavras-chave
Resistência a drogas, Drugs-resistance, Sinais clínicos neurológicos, Tripanossomiases, Cloridrato de isometamidium, Diaceturato de diminazeno, Neurologic signs, Trypanosomiasis, Isometamidium hydrochloride, Diminazene diaceturate