美国呼吸道疾病防控.pptx

美国控制猪呼吸道疾病的经验Control of Swine Respiratory Diseas`e in the USASteven D. Dudley DVMPresident CEO Veterinary Medical Center/Prairie Livestock SupplyWorthington MN我们今天要谈谈下列疾病的控制经验We will talk about Swine Diseases below today圆环病毒病 (PCVD) Porcine circovirus disease蓝耳病(PRRSV)(Blue Ear) 猪流感病毒 Swine Influenza Virus猪圆环病毒-临床症状包括Porcine Circovirus – clinical problems include:影响繁殖Reproductive effects猪圆环相关的繁殖障碍疾病PCV2 Associated Reproductive Failure猪圆环导致胎盘感染PCV2 Uterine infection of piglets对生长猪的影响Effects on Growing Pigs呼吸系统-肺炎 Respiratory – pneumonia消瘦Gaunt waste away pigs皮炎Dermatitis skin lesions肠炎（伴有体重减轻和轻度呼吸系统综合症）Enteritis with weight-loss with minimal respiratory complications加重其他病原的感染Allows other pathogens to become more severe猪圆环感染特点Characteristics of PCV2 Infection猪圆环病毒血症期长，较其它病毒更难以彻底清除PCV2 infection has longer viremia and longer clearance than most other viral diseases. 生命力顽强PCV2 virus is a robust virus that is hard to kill. 猪圆环的免疫抑制可引起其它疾病Immuno-suppression affects from PCV2 are widely noted causing an increase impact of other diseases. 繁殖障碍Reproductive effects of PCV2可在任何时间感染母猪Infection of sows occurs at any time 当母猪和后备母猪的抗体水平下降的时候，仔猪感染风险增加 Risk of infection to piglets increases when sow or gilt antibodies decrease. 感染来源Source of PCV2 infection母猪群感染 Infection to Sow Herd最常见途径是通过阴性后备猪或未免疫后备猪Most common route of infection is naive gilts or poorly vaccinated gilts后备猪出现病毒血症-胎盘带毒继而感染仔猪Gilts become viremic – virus then goes to the uterus and piglets become infected.仔猪感染Infection to Piglets病毒血症的怀孕母猪通过胎盘感染仔猪Piglet infection occurs from sow viremia in utero通过病毒血症产后母猪的鼻腔分泌物感染Exposure to nasal secretions from viremic sows after farrowing初乳带毒Colostrum can be a source of infection 猪圆环在母猪群的流行情况PCV2 prevalence in sow herds Dr. Darin Madsen ISU presentation最近研究表明，临床表现有繁殖障碍的母猪群中，50%以上的母猪感染有圆环病毒 Recent studies show more than 50% of sow herds are affected with some sort of reproductive component. 多数在引进后备母猪时进行免疫 Most herds vaccinate replaceme