Which of the following sexually transmitted infections usually fails to reveal obvious symptoms in women? syphilis epididymitis chancroid gonorrhea

The sexually transmitted infection that usually fails to reveal obvious symptoms in women is syphilis.

Explanation: Syphilis is a sexually-transmitted infection, that is to say that it is a contagious disease spread by sexual activity or close contact with an infected person. The bacteria Treponema pallidum is the one that causes syphilis. Moreover, a woman that has syphilis may not feel nor see any symptoms, which means that, in some cases, syphilis' symptoms may not even be noticed.

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