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Insert middle finger into anus.
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Rotate finger 180deg CW/CCW at least 5 times.
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Remove finger from anus.
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Place finger just below nostrils.
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Inhale deeply through nose.
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If finger smells of feces, the test is inconclusive. Proceed to step 7.
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Place finger into mouth and massage with tongue to clean.
A negative test results when finger no longer smells of feces.