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1·The pig is the only animal in which hog cholera is known to occur naturally.

猪是已知自然发生猪瘟的唯一动物。

2·The method has previously been used to fight rinderpest in Africa and Asia and hog cholera in South America.

这种方法此前曾被用于防控非洲和亚洲的牛瘟，以及南美洲的猪瘟。

3·Purpose: in order to discuss a kind of reasonable immunity procedure for Hog Cholera that suited for our province, we did this experiment.

目的：为了探讨一种比较适合我省的猪瘟合理免疫程序，进行本实验。

4·The artificial induced vertical transmission of hog cholera field virus in experiment was established by breeding 2 pigs which infected with middle toxicity of hog cholera field virus.

利用2头人工感染中等毒力猪瘟野毒耐过猪进行配种，诱发了猪瘟野毒垂直传播。