这是因为病毒性疾病一般发生在病毒的宿主从某个物种跳跃到另一个物种，继而进化以利用新宿主的方式变异之后。
That is because new viral diseases generally happen when a virus mutates in a way that allows it to jump species, and then continues to evolve to exploit its new host.
猪繁殖和呼吸综合症是近年来国内外引人注目的一种新的病毒性猪传染病。
Pig Rebreeding and PRRS is a new noticeable viral infectious pig disease at home and abroad.
通过探讨病毒与宿主相互关系，为预防、治疗、诊断病毒性疾病提供新的理论依据及相应对策。
By probing into the interrelation of the virus and the host we can provide a groundwork for a new theory and a strategy to prevent, treat and diagnose the virus disease.
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