Final answer:
Candida albicans causes approximately 90 percent of vaginal candidiasis cases, becoming pathogenic when the host's defenses are compromised, and is treated with fungicides.
Step-by-step explanation:
About 90 percent of vaginitis cases are caused by microorganisms, with the yeast Candida albicans being the most common causative agent of such infections, referred to as vaginal candidiasis. C. albicans is able to cause disease in the female reproductive tract primarily under conditions that compromise the host's defenses, such as antibiotic therapy, illness, pregnancy, presence of transient microbes, and immunosuppression. While C. albicans is typically part of the normal, healthy microbiota of the body, including the urogenital tract, it can become pathogenic, leading to symptoms like itching, discharge, and odor. Diagnosis of vaginal candidiasis includes microscopic evaluation and may involve molecular tests. Treatment options involve topical or oral fungicides, although prevention can be challenging.