It occurs all the more easily if other sexually diseases such as syphilis, herpes, or chancroid are already present and have caused sores or ulcers through which the virus can enter.

• 如果诸如梅毒、疱疹或软性下疳等其他性传播疾病已经存在，而且已经导致病灶或溃疡的情况下，通过这些病灶或溃疡，艾滋病病毒感染更容易发生。