一个人可能两次感染HIV病毒，这种现象被称为HIV超级感染（HIV Superinfection）。HIV超级感染是指已经感染HIV的个体再次感染不同毒株的HIV病毒。新毒株可能与原毒株在基因序列、耐药性和致病性上存在差异。

Surgery should be reserved for patients with a ruptured abscess, with bacterial superinfection, or when an abscess cannot be accessed by the percutaneous route.

Respiratory syncytial virus (RSV) is the most important cause of infantile bronchiolitis and pneumonia. It is ubiquitous, with most children acquiring their primary infection within the first year ...