A sexually transmitted infection that is caused by a microorganism with two morphologically distinct forms is:
A) Chancroid
B) Candidiasis
C) Trichomonas vaginalis
D) Chlamydia
Ans: D
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Chlamydia exists in two morphologically distinct forms during its unique life—a small infectious elementary body and a large noninfectious reticulate body. T. vaginalis is a large anaerobic, pear-shaped, flagellated protozoan. Chancroid is a disease of the external genitalia and lymph nodes caused by the gram-negative bacterium Haemophilus ducreyi. Candida albicans is the most commonly identified organism in vaginal candidiasis (yeast infection), but other candidal species, such as Candida glabrata and Candida tropicalis may also be present.
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