an infection (= a condition in which bacteria or viruses that cause disease have entered the body) that can be passed from one person to another by sexual activity

The pill does not protect against sexually transmitted infections. 避孕药不能预防性传播感染。

Unlike most sexually transmitted infections, HPV typically runs its course without causing illness. 与大多数性传播感染不同，HPV 通常不会引起疾病。

Sexually transmitted infection (STI) screenings have been a part of the reproductive health landscape for years. 性传播感染（STI）筛查多年来一直是生殖健康领域的组成部分。