【单选题】【消耗次数：1】
CMV的生物学特点，不正确的是（ ）
①
属疱疹科、双链线状DNA 病毒
②
具有潜伏－活化的生物学特性
③
在-20℃和真空干燥可长期保存
④
CMV毒力不强
⑤
一旦感染，终身携带
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