近日，国家农业部向全国各口岸动植物检疫机关发出通知，要求严防痒病从国外传入。痒病与牛海绵状脑病（俗称“疯牛病”）有相关的病原，是一种侵害绵羊和山羊中枢神经系统的潜隐性、退行性疾病，可导致病羊出现精神不振、四肢无力、平衡失调，厌食直至瘫痪等症状。潜伏期长达 Recently, the Ministry of Agriculture issued a circular to all ports of entry of animal and plant quarantine authorities in the country to prevent itch from being imported from abroad. Itch is a causative agent of bovine spongiform encephalopathy (BSE), a latent and degenerative disease that attacks the central nervous system of sheep and goats. It can cause deafness, weakness and imbalances in the sick sheep , Anorexia until paralyzed and other symptoms. Latency up to