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Prevalência da febre Q em leite de tanque de vacarias do centro litoral de Portugal
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Orientador(es)
Resumo(s)
O presente estudo visou avaliar a prevalência de anticorpos anti-Coxiella burnetii presentes no leite de tanque de vacarias do centro litoral, utilizando um teste ELISA. Participaram 84 vacarias pertencentes à zona de intervenção da cooperativa agrícola Proleite, a qual se situa no distrito de Aveiro. Amostras de leite de tanque foram recolhidas de todas as vacarias e analisadas através de testes serológicos. A prevalência aparente obtida foi muito elevada, atingindo os 90,5%, o que corresponde a 76 explorações. O resultado negativo foi obtido em sete vacarias (8,3%), e apenas uma revelou ser duvidosa (1,2%). Paralelamente, foi efetuado um estudo em 38 das vacarias participantes, sobre os fatores de risco associados à prevalência positiva, recorrendo a um questionário de resposta aberta, feito presencialmente aos produtores. Após a análise estatística dos 14 fatores estudados, foram obtidos quatro que mostraram ter associação positiva ou negativa dependendo dos grupos de variáveis, nomeadamente as raças presentes na exploração (p=0,012), o tipo de cama (p=0,048), a frequência do controlo reprodutivo (p=0,006) e a presença de parque pré-parto (p=0,049). Foram também estudadas as consequências reprodutivas e produtivas, e das sete variáveis analisadas, nenhuma demonstrou ser estatisticamente significativa
ABSTRACT - Prevalence of Q Fever in bulk tank milk of dairy cow farms in the central west coast of Portugal - The present study aimed to evaluate the prevalence of antibody against C. burnetii, present in the bulk tank milk of dairy cow farms in the coastal center area, through an ELISA test, applied in 84 dairy farms within the intervention circle of the agriculture cooperative Proleite, which is located in the district of Aveiro. Bulk milk samples were collected from all dairy farms, and were analyzed through serological testing. The apparent prevalence obtained was very high, reaching 90,5%, which corresponds to 76 farms. Negative results were obtained in seven farms (8,3%), and only one (1,2%) had a doubtful outcome. At the same time, 38 of the studied dairy farms, participated in a survey which aimed to understand the association between the putative risk factors and the prevalence. After the statistical analysis, it was concluded that only four of the 14 risk factors studied demonstrated to have a positive or negative association depending on the group of variables, in particular the breeds present (p=0,012), the type of bedding (p=0,048), the reproductive control frequency (p=0,006) and the existence of a calving pen (p=0,049). Finally, the reproductive consequences, and also the production ones, were studied using seven variables. Of these, none showed statistical
ABSTRACT - Prevalence of Q Fever in bulk tank milk of dairy cow farms in the central west coast of Portugal - The present study aimed to evaluate the prevalence of antibody against C. burnetii, present in the bulk tank milk of dairy cow farms in the coastal center area, through an ELISA test, applied in 84 dairy farms within the intervention circle of the agriculture cooperative Proleite, which is located in the district of Aveiro. Bulk milk samples were collected from all dairy farms, and were analyzed through serological testing. The apparent prevalence obtained was very high, reaching 90,5%, which corresponds to 76 farms. Negative results were obtained in seven farms (8,3%), and only one (1,2%) had a doubtful outcome. At the same time, 38 of the studied dairy farms, participated in a survey which aimed to understand the association between the putative risk factors and the prevalence. After the statistical analysis, it was concluded that only four of the 14 risk factors studied demonstrated to have a positive or negative association depending on the group of variables, in particular the breeds present (p=0,012), the type of bedding (p=0,048), the reproductive control frequency (p=0,006) and the existence of a calving pen (p=0,049). Finally, the reproductive consequences, and also the production ones, were studied using seven variables. Of these, none showed statistical
Descrição
Dissertação de Mestrado Integrado em Medicina Veterinária, na área científica de Clínica
Palavras-chave
Coxiella burnetii Prevalência Leite de tanque ELISA Fatores de risco Coxiella burnetii Prevalence Bulk tank milk ELISA Risk factors
Contexto Educativo
Citação
Leitão MTPC. 2023. Prevalência da febre Q em leite de tanque de vacarias do centro litoral de Portugal [dissertação de mestrado]. Lisboa: FMV-Universidade de Lisboa
Editora
Universidade de Lisboa, Faculdade de Medicina Veterinária