请教问题

health mice易排除A virus, but non-nutritional mice easy to infect A virus.且感染后, A会转变成B virus,which lethal to healthy and non-nutritional mice. So when non-nutritional mice 存在于鼠群,整个鼠群都将十分危险,问评价?

答案:A virus是否communicable to healthy mice.

该答案肯定可加强结论怎么分析?题目中是non-nutritional mice easy to infect a virus and then transfered to b, 和 HEALTH MICE根本关联不上,请指教,谢谢!

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请您贴完整题目吧， 谢谢。