a type of virus that is not serious for most people but can kill or severely affect babies or people who do not have a strong immune system, such as people with HIV

They were infected with cytomegalovirus, a type of herpes. 他们感染了巨细胞病毒，这是一种疱疹病毒。

After cytomegalovirus infection you have to wait six months before donating blood again. 感染巨细胞病毒后，必须等六个月才能再次献血。