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1 STDs affect men and women. In many cases the health problems they cause can be more severe for women. 2  STDs caused by bacteria can be treated and often cured with antibiotics. Some bacterial STDs include chlamydia, gonorrhea, trichomoniasis, and syphilis.  STDs caused by viruses can be controlled, but not cured.
For example, when the normal, protective bacteria are eradicated by antibiotics (taken to treat a urinary tract, respiratory, or other types of infection) or by immunosuppressive drugs, the yeast can multiply, invade tissues, and cause irritation of the lining of the vagina (vaginitis).