FACTOID # 100: The United States puts 0.7 % of its population in Prison - a vastly higher percentage than any other nation.
 
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PPD may stand for:


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MedlinePlus Medical Encyclopedia: PPD skin test (781 words)
The purified protein derivative (PPD) is an antigen used to aid in the diagnosis of tuberculosis infection.
The PPD extract is then injected into the most superficial layer under the skin resulting in a blister on the skin.
Your PPD may be falsely negative or the standards for interpreting a reaction may be different.
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