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Authors
Abstract(s)
O objetivo deste estudo foi determinar a prevalência de anticorpos contra a Coxiella
burnetii em bovinos de explorações leiteiras da ilha Terceira e investigar os fatores de
risco que contribuem para a infeção e disseminação da febre Q no rebanho. As amostras
de leite de tanque (BTM) foram obtidas, a partir de 132 explorações leiteiras
selecionadas aleatoriamente e analisadas utilizando um kit ELISA. A prevalência
aparente foi de 75,8 % (IC 95%: 67,8-82,3). A proporção de rebanhos negativos e
duvidosos foi de 18,2 % (12,5-25,6%) e 6% (3,1-11,5%), respetivamente. Os resultados
demonstraram uma distribuição uniforme dos casos positivos pelos dois concelhos da
ilha Terceira. Na análise univariada, três fatores foram identificados por apresentarem
uma associação significativa com a presença de anticorpos anti-C. burnetii em BTM,
nomeadamente o tamanho do rebanho (> 50 animais), o contacto dos animais com
bovinos de outras explorações e a convivência direta dos animais com cães ou gatos
dentro da exploração. Pelo que sabemos, este é o primeiro estudo a relatar a infeção por
C. burnetii em bovinos leiteiros na Região Autónoma dos Açores, mostrando que a
febre Q é bastante prevalente na ilha Terceira.
ABSTRACT - Prevalence and risk factors for Coxiella burnetii in Terceira Island dairy cattle herds. - The main goal of this study was to determine the prevalence of antibodies against Coxiella burnetii in cattle from dairy farms in Terceira Island and investigate the risk factors which contribute to the infection and dissemination of Q fever in the herd. Bulk tank milk (BTM) samples were obtained from 132 randomly selected dairy farms and analyzed using an ELISA kit. The apparent prevalence was of 75,8% (IC 95%: 67,8- 82,3). The proportion of negative and inconclusive herds was of 18,2% (12,5-25,6%) and 6% (3,1-11,5%) respectively. The results demonstrated a uniform distribution of positive cases in both counties of Terceira Island. In the univariate analyses, three factors were identified as presenting a significant association with the presence of anti- C. burnetii antibodies in BTM, namely the size of the herd (>50 animals), the contact of the animals with bovines from other farms and the direct interaction of the animals with dogs or cats within the farm. As much as we know, this is the first study reporting the infection by C. burnetii in dairy cattle in Região Autónoma of the Azores, showing that Q fever is quite prevalent in Terceira Island.
ABSTRACT - Prevalence and risk factors for Coxiella burnetii in Terceira Island dairy cattle herds. - The main goal of this study was to determine the prevalence of antibodies against Coxiella burnetii in cattle from dairy farms in Terceira Island and investigate the risk factors which contribute to the infection and dissemination of Q fever in the herd. Bulk tank milk (BTM) samples were obtained from 132 randomly selected dairy farms and analyzed using an ELISA kit. The apparent prevalence was of 75,8% (IC 95%: 67,8- 82,3). The proportion of negative and inconclusive herds was of 18,2% (12,5-25,6%) and 6% (3,1-11,5%) respectively. The results demonstrated a uniform distribution of positive cases in both counties of Terceira Island. In the univariate analyses, three factors were identified as presenting a significant association with the presence of anti- C. burnetii antibodies in BTM, namely the size of the herd (>50 animals), the contact of the animals with bovines from other farms and the direct interaction of the animals with dogs or cats within the farm. As much as we know, this is the first study reporting the infection by C. burnetii in dairy cattle in Região Autónoma of the Azores, showing that Q fever is quite prevalent in Terceira Island.
Description
Dissertação de Mestrado Integrado em Medicina Veterinária
Keywords
Febre Q Coxiella burnetii Bovinos leiteiros Prevalência BTM ELISA Fatores de risco Ilha Terceira Q fever Dairy cattle Prevalence Risk factos Terceira Island
Pedagogical Context
Citation
Rodrigues, R.E. (2019). Prevalência e fatores de risco para presença de Coxiella burnetii em explorações leiteiras da Ilha Terceira. Dissertação de mestrado. Universidade de Lisboa, Faculdade de Medicina Veterinária, Lisboa
Publisher
Universidade de Lisboa, Faculdade de Medicina Veterinária