A 26-year-old woman has an odorous vaginal discharge,lower abdominal pain,and difficulty urinating.Vaginal secretions are collected and sent to the laboratory for examination 3 hours after collection.No motile organisms are observed on the wet preparation;however,T.vaginalis is suspected.Which one of the following statements explains this discrepancy?

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The identification of T.vaginalis is often based on the examination of wet preparations of vaginal and urethral discharges and prostatic secretions.This examination must be performed within 10 to 20 minutes after sample collection;if not,the organisms lose motility and may not be identified.Several specimens may have to be examined for the detection of the organisms.

A 26-Year-Old Woman Has an Odorous Vaginal Discharge,lower Abdominal Pain,and