1) If someone was treated for cancer over 3 years ago, is he considered in the risk group? 2) Once recovered, does the virus disappear or it stays dormant like a herpes? / (1)请问如果一位患者曾经患 有癌症，但在3年前已经被治愈 了，那他/她还会被归入高危群 体吗?(2)被治愈后，病毒就 会消失吗?还是会像疱疹病毒 一样潜伏在体内?