Avaliação da eficácia de bacterinas comerciais no controle da infecção por Salmonella Enteritidis em galinhas de postura comercial
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Data
2007-01-31
Autores
Moura, Aline Mesquita Galvão [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Devido ao grande número de casos de toxinfecção alimentar e aos prejuízos sócio-econômicos causados pela Salmonella Enteritidis aos seres humanos, tornam-se necessário estudos sobre a prevenção e controle desta bactéria nos plantéis avícolas. Assim, o objetivo deste trabalho foi a análise do emprego de bacterinas inativadas oleosas contra Salmonella enterica sorovar Enteritidis (SE) em aves de postura comercial, visando prevenir a excreção fecal e a contaminação dos ovos. Foram utilizadas três formulações de bacterinas comerciais de SE em emulsão oleosa. As aves foram vacinadas na oitava e décima sexta semana de idade e foi mantido um grupo de aves sem vacinação (controle). Na vigésima semana de idade, treze aves de cada tratamento foram desafiadas com uma dose oral de aproximadamente 109 células viáveis de SE fagotipo 4 (resistente ao ácido nalidíxico e a espectomicina), sendo que este procedimento foi repetido na vigésima quinta e trigésima primeira semanas de idade. A eficácia das vacinas empregadas foi conferida através de exames laboratoriais, para pesquisa de SE no conteúdo cecal, baço, ovário e ovos. A vacinação conferiu proteção parcial contra colonização de SE no ceco e contra eliminação da bactéria nas fezes e nos ovos, portanto, recomenda-se que o uso das bacterinas seja complementado com outras formas de controle para SE.
Due to the great number of outbreaks of food poisoning and the socioeconomic issues caused to the human beings by the Salmonella Enteritidis, it becomes necessary the study on the prevention and control of this bacterium in the poultry flocks. Thus, the objective of this work was the analysis of the use of bacterins against Salmonella Enteritidis infection in commercial birds, aiming to prevent the fecal excretion and the contamination of eggs. Have been used three Salmonella Enteritidis oil-emulsion commercial bacterins formulations. The laying hens were vaccinated in the eighth and sixteenth weeks old and one group of birds was kept as nonvacinated control. On twentieth weeks ago, thirteen birds of each treatment were challenged with an oral dose of approximately 109 viable cells of phage type 4 Salmonella Enteritidis (resistant to the acid nalidixic and the espectomicin), this procedure was repeated in the twentieth fifth and thirtieth first weeks ago. The efficacy of employed vaccines was conferred through laboratorial examinations, for research of SE from fecal samples, spleen, ovary and eggs. The vaccination conferred partial protection against caecal colonization and against shedding of SE in the feces and eggs, therefore, it is recommended that the use of the killed bacterins be complemented with other forms of SE control.
Due to the great number of outbreaks of food poisoning and the socioeconomic issues caused to the human beings by the Salmonella Enteritidis, it becomes necessary the study on the prevention and control of this bacterium in the poultry flocks. Thus, the objective of this work was the analysis of the use of bacterins against Salmonella Enteritidis infection in commercial birds, aiming to prevent the fecal excretion and the contamination of eggs. Have been used three Salmonella Enteritidis oil-emulsion commercial bacterins formulations. The laying hens were vaccinated in the eighth and sixteenth weeks old and one group of birds was kept as nonvacinated control. On twentieth weeks ago, thirteen birds of each treatment were challenged with an oral dose of approximately 109 viable cells of phage type 4 Salmonella Enteritidis (resistant to the acid nalidixic and the espectomicin), this procedure was repeated in the twentieth fifth and thirtieth first weeks ago. The efficacy of employed vaccines was conferred through laboratorial examinations, for research of SE from fecal samples, spleen, ovary and eggs. The vaccination conferred partial protection against caecal colonization and against shedding of SE in the feces and eggs, therefore, it is recommended that the use of the killed bacterins be complemented with other forms of SE control.
Descrição
Palavras-chave
Salmonella enteritidis, Galinha, Bacterina, Galinha de postura, Bacterins, Laying hens
Como citar
MOURA, Aline Mesquita Galvão. Avaliação da eficácia de bacterinas comerciais no controle da infecção por Salmonella Enteritidis em galinhas de postura comercial. 2007. viii, 45 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2007.