We interestingly read a recently published study by Huang SH et al (1). They conducted a case-control study including 49 seroreverters cases (as case group) and 196 non seroreverters cases (as control) to identify associated factors of seroreversion and followed HIV-positive adults who had mounted seroresponses after completing two doses of HAV vaccination during a recent outbreak of acute hepatitis A.

中文翻译：

---

给编辑的信：关于匹配病例对照研究中匹配的方法论问题

我们有趣地阅读了 Huang SH 等人最近发表的一项研究 (1)。他们进行了一项病例对照研究，其中包括 49 例血清转化病例（作为病例组）和 196 例非血清转化病例（作为对照），以确定血清转化的相关因素，并跟踪在完成两剂 HAV 疫苗接种后出现血清反应的 HIV 阳性成年人。最近爆​​发的急性甲型肝炎。