Coxiella burnetii in slaughterhouses in Brazil: A public health concern.

Q fever is an important zoonosis, yet it is often neglected and can present large outbreaks, as observed in the Netherlands. In the past few years, cases of Q fever have been described in Brazil; however, the epidemiological situation of Q fever in ruminants, the main reservoir of the pathogen, is unknown in this country. Our study aimed to estimate the prevalence of C. burnetii in cattle sent to slaughterhouses using an immunofluorescence assay (IFA) and quantitative real-time PCR (qPCR). From 1515 cattle serum samples collected from nine slaughterhouses, 23.8% (360/1515) were serologically positive by IFA (cutoff titer>1:64), indicating past or recent exposure to C. burnetii infection. Among the 54 cities sampled during the study, 83.3% (45/54) had at least one seropositive animal. Subsequently, all seropositive samples were submitted to qPCR for C. burnetii DNA, and 12.2% (44/360) of the sera were qPCR positive, which indicates bacteremia and suggests active or recent infection. The results highlight the risk for abattoir workers that results from exposure to contaminated aerosols produced during slaughter procedures. Moreover, the heat maps that were construction from the positive samples demonstrate the widespread distribution of C. burnetii in the State of São Paulo, Brazil and denotes the need for surveillance and preventive measures to reduce the prevalence in cattle.

Real-time quantitative PCR-based detection of Coxiella burnetii in unpasteurized cow's milk sold for human consumption.

Coxiella burnetii is a zoonotic pathogen with a worldwide distribution that is responsible for Q fever in humans. It is a highly infectious bacterium that can be transmitted from cattle to humans through the consumption of unpasteurized milk. We report the molecular identification of C. burnetii in raw cow's milk being sold directly for human consumption in Brazil without official inspection or pasteurization. One hundred and twelve samples of raw milk were analysed by real-time quantitative PCR (qPCR), and C. burnetii was detected in 3.57% (4/112) of the samples at a concentration ranging from 125 to 404 bacteria per millilitre. The identification of this zoonotic pathogen in raw milk sold directly for human consumption is a public health concern since C. burnetii can be transmitted through the oral route. This result indicates that health education and other preventive measures should be officially implemented in Brazil to prevent the spread of infection. To our knowledge, this is the first qPCR-based detection of C. burnetii in raw milk samples from cows sold in Brazil that do not undergo official inspection or pasteurization.

Ação trófica de aditivos fitogênicos, glutamina e ácido glutâmico sobre a Bursa de Fabrícius e intestino delgado de frangos de corte / Trophic action of phytogenic additives, glutamine and glutamic acid on Bursa Fabricii and small intestine of broilers

The aim of this study was to evaluate the effect of phytogenic additives and glutamine plus glutamic acid, associated or not, on histomorphometry of bursa of Fabricius and small intestine, oocyst count and lesion scores, and carbon turnover of duodenal mucosa of broiler chickens infected with Eimeria acervulina. A total of 450 male broiler chickens was distributed into a completely randomized design with six treatments and three replications. Treatments consisted of control diet (CD); CD + coccidiosis vaccine; CD + antibiotic performance enhancers and anticoccidial (APE/AC); CD + glutamine and glutamic acid (Gln/Glu); CD + phytogenic additives (PA); CD + Gln/Glu + PA. Birds on treatment CD + vaccine were vaccinated via drinking water at three days of age against coccidiosis. At 16 days of age all birds of all treatments were inoculated orally and individually with 500,000 oocysts of Eimeria acervulina. There was no treatment effect on lesion score in the intestinal epithelium of birds. The smaller number of excreted oocysts was observed in groups of birds fed diets containing APE/AC and PA. Were observed better results of villus height and crypt depth for duodenum and ileum of birds of treatments containing Gln/Glu at 7 days of age, and Gln/Glu and PA at 21 days of age. Higher percentage of cortical area from bursa follicles was observed in birds fed diets supplemented with Gln/Glu and PA at 7, 14 and 21 days of age. Increased turnover of intestinal mucosa was observed in treatments containing Gln/Glu, indicating acceleration in development and regeneration of damaged tissue. Glutamine plus glutamic acid and phytogenic additives can provide improvements to structure, and thus to intestinal function, as well as to better immune response against the infectious challenges. Phytogenic additives can be used for coccidiosis control of broiler chickens where the use of antibiotic performance enhancers and anticoccidials is prohibited...

O objetivo deste trabalho foi avaliar o efeito dos aditivos fitogênicos e da glutamina mais ácido glutâmico, associados ou não, sobre a histomorfometria da Bursa de Fabricius e intestino delgado, sobre contagem de oocistos e escores de lesão e sobre o turnover do carbono da mucosa intestinal de frangos de corte experimentalmente infectadas com Eimeria acervulina. Para isso foram utilizados 450 pintos de corte machos distribuídos em delineamento inteiramente casualisado, com seis tratamentos e três repetições. Os tratamentos consistiram de dieta controle (DC); DC + Vacina de coccidiose; DC + antibióticos melhoradores de desempenho e anticoccidiano (AMD/AC); DC + glutamina e ácido glutâmico (Gln/Glu); DC + sditivos fitogênicos (AFs); DC + Gln/Glu + AFs. As aves do tratamento DC + Vacina foram vacinadas via água de bebida, aos três dias de idade, contra coccidiose. Aos 16 dias de idade todas as aves de todos os tratamentos foram inoculadas oralmente e individualmente com 500.000 oocistos de Eimeria acervulina. Não houve efeito dos tratamentos para escore de lesão no epitélio intestinal das aves. O menor número de oocistos excretados foi observado nos grupos de aves alimentadas com dieta contendo AMD/AC e AFs. Foram observados melhores resultados para altura das vilosidades e profundidade das criptas do duodeno e ílio das aves dos tratamentos contendo Gln/Glu, aos 7 dias de idade e Gln/Glu e AFs aos 21 dias de idade. Maior porcentagem de área cortical dos folículos bursais foi observada em aves alimentadas com dieta suplementada com Gln/Glu e AFs aos 7, 14 e 21 dias de idade. Maior turnover da mucosa intestinal foi observada em aves dos tratamentos contendo Gln/Glu, indicando aceleração do desenvolvimento e regeneração do tecido lesado. Glutamina mais ácido glutâmico e aditivos fitogênicos podem oferecer melhorias à estrutura e, consequentemente, à função do intestino, bem como melhores condições para resposta imune frente à desafios infecciosos...

Turnover de carbono nos tecidos de frangos de corte em diferentes fases de crescimento / Carbon turnover in poultry tissues at different growth stages

Este trabalho objetivou determinar o turnover do carbono no Pectoralis major, quilha, tíbia e fígado de frangos de corte em seus diferentes períodos de crescimento, utilizando a técnica dos isótopos estáveis. Foram utilizados 216 pintos de corte, machos, Cobb. O delineamento experimental foi inteiramente casualizado e consistiu de sete tratamentos com dias de substituição das dietas distintos: 0; 7; 14; 21; 28; 35; 42 dias de idade. Para mensurar o turnover do carbono nos tecidos em determinado intervalo de tempo, foi utilizado o modelo sigmoidal de regressão de Boltzmann ou função exponencial do tempo. Os valores de meias-vidas foram: 2,5; 2,8; 2,9; 4,9; 5,1; 5,5 e 6,0 dias para músculo peitoral; 2,7; 2,9; 3,1; 4,6; 5,3; 4,1 e 8,0 dias para quilha; 4,4; 3,6; 5,4; 5,8; 4,3; 5,2 e 6,3 dias para tíbia e 1,3; 1,9; 1,4; 1,5; 1,9; 1,7 e 2,1 dias para fígado, nos tratamentos T1, T2, T3, T4, T5, T6 e T7, respectivamente. Pode-se concluir que a tíbia possui metabolismo lento e pode indicar o sinal isotópico das dietas iniciais da criação dos frangos de corte; e o fígado, metabolismo rápido, indicado para refletir a dieta próxima da fase de avaliação.

The aim of this study was to evaluate carbon turnover on muscle tissue Pectoralis major, keel, tibia and liver of poultry at different life stages using the carbon stable isotopes technique. 216 male chick lings (Cobb) were used. The trial was conduced in a totally random distribution consisting on seven treatments with distinct days for diet substitution (0, 7, 14, 21, 28, 35, 42 days old). Either Boltzmann sigmoid regression or the exponential time function were used in order to measure the carbon isotopic turnover in a specific period of time. The half-life were: 2.5; 2.8; 2.9; 4.9; 5.1; 5.5 e 6.0 day on muscle tissue; 2.7; 2.9; 3.1; 4.6; 5.3; 4.1 e 8.0 day on keel; 4.4; 3.6; 5.4; 5.8; 4.3; 5.2 e 6.3 day on tibia and 1.3; 1.9; 1.4; 1.5; 1.9; 1.7 and 2.1 day on liver, for to treatments T1, T2, T3, T4, T5, T6 e T7 respectively. According to the results of this study, it is possible to conclude that the tibia has slowest metabolism and may indicate the isotopic signature of initial diets of poultry culture. The fast metabolism tissue, liver, is appropriated to reflect the diets fed at closer period of evaluation.

Nucleotídeos na dieta de frangos de corte e seus efeitos sobre taxa de turnover da mucosa intestinal antes e após lesões causadas por coccidiose / Nucleotides in broilers challenged diet and its effects on intestinal mucosa turnover rate before and after injuries caused by coccidiose

O objetivo deste trabalho foi avaliar o efeito da dieta suplementada com nucleotídeos sobre taxa de turnover da mucosa intestinal de frangos antes e após lesões causadas por coccidiose por meio de análise isotópica, utilizando a variação do carbono-13 em plantas C3 e C4. Foram utilizados 264 pintos submetidos a dois tratamentos: dieta controle e dieta suplementada com 0,07 por cento nucleotídeos. Os pintos possuíam sinais isotópicos em seus tecidos semelhantes ao de ditas C4. Após o alojamento, para avaliar taxa de turnover da mucosa, as aves receberam dietas predominantemente C3. Com 16 dias de idade, 50 por cento das aves de cada tratamento foram inoculadas com oocistos de Eimeria acervulina e, a partir de 21 dias, para avaliar a taxa de turnover após desafio, as aves passaram a receber dieta predominantemente C4. Amostras de mucosa foram analisadas isotopicamente por espectrometria de massa. Na fase inicial, a suplementação com nucleotídeos propiciou aceleração na troca do carbono na mucosa, com meia-vida de 1,06 e 1,01 dias para dieta controle e com nucleotídeos, respectivamente, acelerando o crescimento intestinal. Na fase de 21 a 42 dias de idade, para os grupos não desafiados com coccidiose, as meias-vidas do carbono foram 1,81 e 1,80 dias para dieta controle e com nucleotídeos, respectivamente, não havendo influência dos tratamentos. Porém, nos grupos desafiados, as meias-vidas foram 1,01 dias no grupo controle e 0,75 dias no que recebeu dieta com nucleotídeos, indicando maior turnover da mucosa nesse último grupo. A adição de nucleotídeos promove aceleração no processo de renovação da mucosa intestinal e na regeneração após danos causados por coccidiose.

The objective was to evaluate the effect of nucleotides supplementation diet on the intestinal mucosa turnover rate of broilers before and after injury caused by coccidiosis, through isotopic analysis, using the carbon-13 variation in C³ and C4 plants. It was used 264 chicks under two treatments: control diet and diet supplemented with 0.07 percent nucleotides. The chicks had isotopic signals in their tissues similar to C4 diet. After housing, to assess mucosal turnover rate, the birds were fed with a predominantly C3 diet. At 16 days of age, 50 percent of birds from each treatment were inoculated with Eimeria acervulina oocysts and starting from 21 days, to assess the mucosa turnover rate after challenge, the birds received predominantly C4 diet. Samples of intestinal mucosa were isotopically analyzed by mass spectrometry. In the initial phase, supplementation with nucleotides led acceleration in carbon trading in the mucosa, with half-lives of 1.06 and 1.01 days for control diet and with nucleotides, respectively, accelerating intestinal growth. During the 21 to 42 days of age, for not coccidiosis challenged groups, the carbon half-lives were 1.81 and 1.80 days for control diet and with nucleotides respectively, without any influence of the treatments. However, in the challenged groups, the half-lives were 1.01 days in control group and 0.75 days in group receiving nucleotides diet supplementetion, indicating a higher mucosa turnover rate in the latter group. The addition of nucleotides promotes acceleration in the cell renewal process of intestinal mucosa and in regeneration after damage caused by coccidiosis.