RESUMO
Theileria equi is the causative agent of worldwide piroplasmosis, an important tick-borne disease of equids associated to a lifetime carrier state of infected horses. Since rapid, accessible and reliable tests have been posted as a challenge for clinicians, the aim of the present study was to verify the agreement between an in-house immunofluorescence antibody assay (IFA) and a commercial competitive inhibition enzyme-linked immunosorbent assay (cELISA) in a population of 198 carthorses from Southern Brazil. The horse seroreactivity for T. equi revealed 152/198 (76.8%) positive samples by IFA and 155/198 (78.3%) by cELISA. Using cELISA as gold standard, IFA has shown a sensitivity of 91.6% (95% CI = 86.18-95.03%) and specificity of 76.7% (95% CI = 62.26-86.85%), with a substantial degree of agreement (k = 0.8445). In conclusion, the in-house IFA may be used as a screening test for diagnosis of equine piroplasmosis.(AU)
Theileria equi é o agente causador da piroplasmose no mundo, é uma importante doença transmitida por carrapatos nos equídeos em todo o mundo, e está associada ao estado de portador nos equinos infectados. Uma vez que testes rápidos, acessíveis e confiáveis são considerados um desafio para os clínicos, o objetivo do presente estudo foi avaliar a concordância entre os testes de imunofluorescência indireta (RIFI) e um ensaio imunoenzimático por competição comercial (cELISA) em uma população de 198 equinos de tração na região Sul do Brasil. A sororreatividade dos cavalos para T. equi mostrou 152/198 (76.8%) amostras positivas para RIFI e 155/198 (78.3%) amostras positivas para cELISA. Utilizando o cELISA como padrão ouro, a RIFI demonstrou sensibilidade de 91.6% (95% CI = 86.18-95.03%) e especificidade de 76.7% (95% CI = 62.26-86.85%), com uma concordância de grau substancial (k = 0.8445). Em conclusão, a RIFI pode ser utilizada como um teste de triagem para o diagnóstico de piroplasmose equina.(AU)
Assuntos
Animais , Cavalos/imunologia , Testes Sorológicos/veterinária , Theileria/citologia , Babesiose , Estudos SoroepidemiológicosRESUMO
Theileria equi is the causative agent of worldwide piroplasmosis, an important tick-borne disease of equids associated to a lifetime carrier state of infected horses. Since rapid, accessible and reliable tests have been posted as a challenge for clinicians, the aim of the present study was to verify the agreement between an in-house immunofluorescence antibody assay (IFA) and a commercial competitive inhibition enzyme-linked immunosorbent assay (cELISA) in a population of 198 carthorses from Southern Brazil. The horse seroreactivity for T. equi revealed 152/198 (76.8%) positive samples by IFA and 155/198 (78.3%) by cELISA. Using cELISA as gold standard, IFA has shown a sensitivity of 91.6% (95% CI = 86.18-95.03%) and specificity of 76.7% (95% CI = 62.26-86.85%), with a substantial degree of agreement (k = 0.8445). In conclusion, the in-house IFA may be used as a screening test for diagnosis of equine piroplasmosis.
Theileria equi é o agente causador da piroplasmose no mundo, é uma importante doença transmitida por carrapatos nos equídeos em todo o mundo, e está associada ao estado de portador nos equinos infectados. Uma vez que testes rápidos, acessíveis e confiáveis são considerados um desafio para os clínicos, o objetivo do presente estudo foi avaliar a concordância entre os testes de imunofluorescência indireta (RIFI) e um ensaio imunoenzimático por competição comercial (cELISA) em uma população de 198 equinos de tração na região Sul do Brasil. A sororreatividade dos cavalos para T. equi mostrou 152/198 (76.8%) amostras positivas para RIFI e 155/198 (78.3%) amostras positivas para cELISA. Utilizando o cELISA como padrão ouro, a RIFI demonstrou sensibilidade de 91.6% (95% CI = 86.18-95.03%) e especificidade de 76.7% (95% CI = 62.26-86.85%), com uma concordância de grau substancial (k = 0.8445). Em conclusão, a RIFI pode ser utilizada como um teste de triagem para o diagnóstico de piroplasmose equina.
Assuntos
Animais , Babesiose , Cavalos/imunologia , Testes Sorológicos/veterinária , Theileria/citologia , Estudos SoroepidemiológicosRESUMO
The name Theileria electrophori n.sp. is proposed for a small parasite described in the erythrocytes of the electric eel, Electrophorus electricus, from Amazonian Brazil. Division of the organism in the erythrocyte produces only four bacilliform daughter cells which become scattered in the host cell, without a cruciform or rosette-shaped disposition. Exoerythrocytic meronts producing a large number of merozoites were encountered in Giemsa-stained impression smears of the internal organs, principally in the liver, and are presumably the source of the intraerythrocytic forms of the parasite. This developmental pattern is characteristic of piroplasms within the family Theileriidae, where the author considers the parasite of E. electricus to most appropriately belong. It effectively distinguishes the organism from the dactylosomatid parasites Babesiosoma Jakowska and Nigrelli, 1956 and Dactylosoma Labbé, 1894 also found in fishes. This appears to be the second report of Theileria Bettencourt, Franca and Borges, 1907 in a fish.
Assuntos
Electrophorus/parasitologia , Eritrócitos/parasitologia , Theileria/isolamento & purificação , Animais , Corantes Azur , Brasil , Theileria/citologiaRESUMO
The name Theileria electrophori n.sp. is proposed for a small parasite described in the erythrocytes of the electric eel, Electrophorus electricus, from Amazonian Brazil. Division of the organism in the erythrocyte produces only four bacilliform daughter cells which become scattered in the host cell, without a cruciform or rosette-shaped disposition. Exoerythrocytic meronts producing a large number of merozoites were encountered in Giemsa-stained impression smears of the internal organs, principally in the liver, and are presumably the source of the intraerythrocytic forms of the parasite. This developmental pattern is characteristic of piroplasms within the family Theileriidae, where the author considers the parasite of E. electricus to most appropriately belong. It effectively distinguishes the organism from the dactylosomatid parasites Babesiosoma Jakowska and Nigrelli, 1956 and Dactylosoma Labbé, 1894 also found in fishes. This appears to be the second report of Theileria Bettencourt, Franca and Borges, 1907 in a fish.