Molecular and serological diagnosis for Leptospira spp. in biological samples of cattle collected during the slaughter line / Diagnóstico molecular e sorológico para Leptospira spp. em amostras biológicas de bovinos coletadas durante a linha de abate / Diagnóstico molecular y serológico para Leptospira spp. en muestras biológicas de bovinos recogidas durante la línea de sacrificio

A leptospirose é considerada uma zoonose bacteriana de importância para a saúde pública. É comum em áreas tropicais, especialmente em países em desenvolvimento com escassos recursos de saúde e saneamento. Este estudo avaliou a presença de Leptospira spp. em bovinos abatidos em frigorífico da região Centro-Oeste de São Paulo, Brasil, e identificou animais positivos tanto por sorologia quanto em análise molecular. Amostras biológicas de sangue, fígado e rins de 150 bovinos foram investigadas pela técnica de Soroaglutinação Microscópica (SAM) e Reação em Cadeia da Polimerase convencional (cPCR). Os resultados sorológicos mostraram que dos 150 animais, 71 (47,3%) foram reagentes. Os resultados moleculares mostraram a presença de Leptospira spp. nos rins de 21 animais (14%), no fígado de 5 animais (3,3%), no fígado e rins em 2 animais (1,3%) e no sangue em 1 animal (0,7%). Esses resultados indicam um alerta sobre a saúde dos bovinos de corte devido à possibilidade desses animais serem fonte de infecção e a importância da característica ocupacional desta doença. Verificou-se também a importância de complementar as técnicas sorológicas e moleculares.

Leptospirosis is considered a bacterial zoonosis of public health importance. It is common in tropical areas, especially in developing countries with scarce health and sanitation resources. This study evaluated the presence of Leptospira spp. in slaughtered bovine in a slaughterhouse in the Midwest region of São Paulo, Brazil, as well as identified positive animals both in serology and by molecular analysis. Biological samples of blood, liver and kidneys from 150 cattle were investigated by the technique of Microscopic Agglutination Test (MAT) and conventional Polymerase Chain Reaction (cPCR). The serological results showed that of the 150 animals, 71 (47.3%) were reactive. The molecular results showed the presence of Leptospira spp. in kidneys of 21 (14%) animals, in liver of five (3.3%) animals, in liver and kidneys in two animals (1.3%) and in blood, in one (0.7%) animal. These results indicate a warning about the health of beef cattle due to the possibility of these animals being the source of infection and the importance of the occupational characteristic of this disease. It was also verified the importance of complementing serological and molecular techniques.

La leptospirosis es considerada una zoonosis bacteriana de importancia en salud pública. Es común en áreas tropicales, especialmente en países en desarrollo con escasos recursos de salud y saneamiento. Este estudio evaluó la presencia de Leptospira spp. en bovinos sacrificados en un matadero de región Centro-Oeste de São Paulo, Brasil, así como animales positivos identificados tanto en serología como por análisis molecular. Se investigaron muestras biológicas de sangre, hígado y riñones de 150 bovinos mediante la técnica de Aglutinación Microscópica (MAT) y Reacción en Cadena de la Polimerasa convencional (cPCR). Los resultados serológicos mostraron que de los 150 animales, 71 (47,3%) fueron reactivos. Los resultados moleculares mostraron la presencia de Leptospira spp. en riñones de 21 (14%) animales, en hígado de cinco (3,3%) animales, en hígado y riñones en dos animales (1,3%) y en sangre, en un (0,7%) animal. Estos resultados indican una alerta sobre la salud de los bovinos de carne debido a la posibilidad de que estos animales sean fuente de infección y la importancia de la característica ocupacional de esta enfermedad. También se verificó la importancia de complementar las técnicas serológicas y moleculares.

Seroprevalence of zika virus in a cattle flock

ABSTRACT The present research evaluated the seroprevalence of anti-zika virus (anti-ZIKV) antibodies by virus neutralization test (VNT) in 529 bovines from Andradina city, São Paulo state, Brazil. The reading was performed in an inverted optical microscope, considering reagents when the antibodies were capable to neutralize the ZIKV. Of the 529 samples, 53 (10.01%) were reagents. The animals were healthy at the time of collection. The samples were collected in February 2018, a favorable period for the multiplication of the vector and the highest risk of disease transmission. None of the animals showed anti-bovine viral diarrhea virus (anti-BVDV) antibodies, ruling out a possible cross-reaction, reinforcing the possible contact of the bovine with the ZIKV. In the herd, 88 pregnant females were evaluated; of these, 12 cows were reactive, with no history of reproductive problems or fetal malformations. This is the first research on the seroprevalence of ZIKV in cattle in Brazil, and studies should continue to evaluate cattle as a possible host of this arbovirus and its possible consequences for unique health and agribusiness.

Seroprevalence of zika virus in a cattle flock

The present research evaluated the seroprevalence of anti-zika virus (anti-ZIKV) antibodies by virus neutralization test (VNT) in 529 bovines from Andradina city, São Paulo state, Brazil. The reading was performed in an inverted optical microscope, considering reagents when the antibodies were capable to neutralize the ZIKV. Of the 529 samples, 53 (10.01%) were reagents. The animals were healthy at the time of collection. The samples were collected in February 2018, a favorable period for the multiplication of the vector and the highest risk of disease transmission. None of the animals showed anti-bovine viral diarrhea virus (anti-BVDV) antibodies, ruling out a possible cross-reaction, reinforcing the possible contact of the bovine with the ZIKV. In the herd, 88 pregnant females were evaluated; of these, 12 cows were reactive, with no history of reproductive problems or fetal malformations. This is the first research on the seroprevalence of ZIKV in cattle in Brazil, and studies should continue to evaluate cattle as a possible host of this arbovirus and its possible consequences for unique health and agribusiness.

Resposta humoral de bovinos para os toxóides botulínicos C e D

Foi avaliado pelo teste de ELISA indireto a resposta humoral para as toxinas botulínicas tipos C e D em animais vacinados com quatro diferentes produtos comerciais. Empregou-se duas vacinas bivalentes C e D (vacina 1 e vacina 2) e duas polivalentes contendo ainda os toxóides botulínicos tipos C e D (vacina 3 e vacina 4). Para análise foram realizadas seis colheitas de sangue ao longo do experimento, nos dias 0, 42, 75, 160, 250 e 342 após a vacinação. A imunidade passiva em bezerros até os 90 dias de idade, filhos de mães vacinadas com diferentes toxóides comerciais foram avaliados em 75 bezerros, agrupados de acordo com a vacina utilizada na mãe (B1, B2, B3 e B4). Para análise foram realizadas 3 colheitas de sangue, nos dias 5 (± 2), 45 e 90 dias após o nascimento. A avaliação da resposta humoral de bovinos vacinados em diferentes faixas etárias também foi realizada empregando-se uma vacina antibotulínica bivalente (C e D) comercial. Para análise, 90 bovinos foram divididos em 3 grupos de acordo com a faixa etária; animais com idade inferior a 2 anos, entre 2 e 5 anos e superior a 5 anos. Na avaliação da resposta humoral de animais vacinados com quatro diferentes produtos comerciais, para a toxina tipo C, as vacinas 1, 2, 3 e 4 não apresentaram diferenças significativas aos 42 dias da primeira dose. Aos 75 dias, a vacina 1, foi superior às vacinas 3 e 4, induzindo maior produção de anticorpos nos animais, porém não diferiu da vacina 2. Aos 160 dias houve queda na quantidade de anticorpos em todos os grupos, não havendo mais diferenças significativas entre as quatro vacinas testadas. Para a toxina tipo D, aos 42 dias da vacinação, não houve diferenças significativas entre as vacinas 1, 2 e 4, que apresentaram neste momento, valores superiores a vacina 3. No entanto, quando avaliadas aos 75 dias, a vacina 1 apresentou maior produção de anticorpos, diferindo...

To compare the efficiency of an ?in house? ELISA test, standardized to measure antibody C and D from Clostridium botulinum, a survey to analysis four different commercial vaccines was conducted. The vaccines used were two commercial, bivalent botulinum containing subtypes C and D (vaccine 1 and vaccine 2) and other two polyvalent including subtypes C and D. The first trial was blood samples taken at 0, 42, 75, 160, 250 and 342 days after vaccination, whereas the booster was performed at day 42. The second trial, maternal antibodies were also measured taken blood samples from 1-3 months age steers obtained from vaccinated heifers with the same vaccines described above, and divided into four different groups (B1, B2, B3, B4). The blood samples were taken at days 5, 45 and 90 after birth. Third and last trial was humoral response from vaccinated cattle with different age evaluation performed using the commercial Clostridium botulinum vaccine subtype C and D. For this purpose, 90 animals never vaccinated, were divided into 3 groups: 1 - 2 years old; 2 ? animals aged between 2 and 5 years old; 3 ? animals 5 years old. The blood samples were taken 30 days after vaccination after second dose of the vaccine. From the first trial, no significant difference was observed when subtype C was search in sera from animals at 42 days after vaccination. However, at 75 days after vaccination, vaccine 1 was able to induce higher levels of antibodies when compared to vaccine 3 and 4. The antibody level was declining after 160 days post vaccination. For subtype D antigen, at 42 days after vaccination, no differences could be observed. However, at 75 day after vaccination, higher levels of antibodies were observed from animals vaccinated with vaccine 1. Comparing the bivalent vaccines, these were able to induce higher antibodies levels at 75 days after vaccination (toxoid C). In addition, the same...

Viabilidade de Clostridium botulinum tipos C e D na pré-compostagem de carcaça bovina

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