Sour or Stale Odor :

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Trichomoniasis is an infection caused by a protozoan, a microscopic, one-cell animal called a trichomona, which is a sexually transmitted infection that can cause an unpleasantly sour or stale (sometimes fishy) smelly discharge. Women with trichomoniasis may notice genital itching, burning, redness or soreness; urinary discomfort; and a clear, white, yellowish, or greenish vaginal discharge. Trichomoniasis is treatable with antibiotics.