某规模猪场存栏规模1500头母猪，在今年2月份产房母猪分娩过程中无效仔比例升高，特别是死胎比例高达9%，这时候猪场管理者还没有引起重视，断奶后的小猪到保育舍，5-7周龄陆续出现消瘦、背毛粗乱、咳嗽和窜稀等症状，9-10周龄死淘比例高达20%，猪场技术人员每天都在给猪打退烧针进行治疗，但是病情没有任何的好转，反而在3月份的时候母猪后期流产的比例超过5%，猪场这时候也知道了问题的严重性，但是不知道该怎么去解决!
PRRSV is one of several known viruses to cross the placenta that includes parvovirus and Nipah. Infected fetuses suffer from vasculitis， especially of the umbilicus which could be the cause of their death. Fetal death is not uncommon in swine， but it is not a cause of abortion. However， infection of the sow can cause abortion “storms” even if the litter is not affected， possibly through some neuro-endocrine mechanism. Since PRRSV is highly contagious， an infected sow can readily infect her healthy newborn litter causing a respiratory disease that increases the risk of secondary infection . Altogether these pathologies explain the origin of the name PRRS.
来源：农业科技报 农业科技报·中国农科新闻网记者 谷幸专家简介宋战胜，陕西华秦农牧科技有限公司首席技术服务专家、畜牧师，先后多次被农业科技报社、农林卫视等邀请为养殖技术培训讲师。主要从事动物养殖、疫病防治推广和科技培训等工作。
