尽管有持续的消毒努力，他说去年因感染口蹄病的169头牛像这个国家很多其他农场主的一样不得不被宰杀。

Despite continual disinfecting efforts, he says his 169 cattle fell victim to foot-and-mouth disease last year, and like so many other farmers across the country, he had to have them killed.

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牛白血病病毒感染后，牛体发生的持续性淋巴球增多属于良性的淋巴细胞数量增加。

Persistent lymphocytosis in cattle infected with bovine leukemia virus is a benign polyclonal increase in lymphocyte Numbers.

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