求翻译：世界动物卫生组织根据疾病对动物健康及人类公共卫生的危害程度，对动物疫病划分为A类和B类两种疾病，猪瘟被列入A类传染病之一，并为国际重要检疫对象。其特征为发病急，高热稽留和细小血管壁变性，引起全身泛发性小点出血，脾梗死。急性猪瘟由强毒引起，发病率和死亡率高[2]；近年来猪瘟大面积的进行免疫，死亡率降低，以局部散发为主，而弱毒感染不表现临床症状则可能因为不被觉察而造成严重的损失是什么意思？

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In accordance with the World Organization for Animal health and disease in the animal health human public health hazards, degree of animal diseases and B categories are divided into A category two diseases A category, 552 pigs were included in one of the infectious diseases, and as an important inte

World animal health organization basis disease to the animal health and the human public health harm degree, to the animal epidemic disease division

OIE disease degree of harm to human public health and animal health, animal diseases are divided into class a and class b two diseases, one of the classical swine fever was included in a category a infectious disease and quarantine for international importance. Characterized by onset acute, high fev