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Báo cáo thú y: " Field experience with two different vaccination strategies aiming to control infections with Actinobacillus pleuropneumoniae in a fattening pig herd"

Tuyển tập các báo cáo nghiên cứu về bệnh học thý y được đăng trên tạp chí Acta Veterinaria Scandinavica cung cấp cho các bạn kiến thức về bệnh thú yđề tài: Field experience with two different vaccination strategies aiming to control infections with Actinobacillus pleuropneumoniae in a fattening pig herd. | Sjolund and Wallgren Acta Veterinaria Scandinavica 2010 52 23 http www.actavetscand.eom content 52 1 23 AVS ACTAVETERINARIA SCANDINAVICA RESEARCH Open Access Field experience with two different vaccination strategies aiming to control infections with Actinobacillus pleuropneumoniae in a fattening pig herd Marie Sjolund1 2 Per Wallgren1 2 Abstract Background The prevalence of pleurisies recorded at slaughter is increasing in Sweden and acute outbreaks of actinobacillosis that require antimicrobial treatments have become more frequent. As an increased use of antimicrobials may result in the development of antimicrobial resistance it is essential to develop alternative measures to control the disease. Vaccinations present an appealing alternative to antimicrobial treatments. The aim of this work was to evaluate the potential of two different vaccination strategies in a specialized fattening herd affected by actinobacillosis. Methods The study was conducted in a specialized fattening herd employing age segregated rearing in eight units. The herd suffered from infections caused by Actinobacillus pleuropneumoniae serotype 2 confirmed by necropsy and serology. The study included 54 batches of pigs grouped into five periods. Batches of pigs of the second period were vaccinated against actinobacillosis twice and pigs in the fourth period were vaccinated three times. Batches of pigs of the first third and fifth period were not vaccinated. Concentrations of serum antibodies to A. pleuropneumoniae and serum amyloid A SAA were analysed and production data were recorded. Results Despite vaccinating medical treatments were required to reduce the impact of the disease. The mean incidence of individual treatments for respiratory diseases during the rearing period ranged from 0 to 4.7 1.8 and was greatest during the triple vaccination period period IV p 0.05 when compared to other groups . A large proportion of the vaccinated pigs seroconverted to A. pleuropneumoniae serotype 2 in .