FACTOID # 145: Three of the top ten countries for GDP per capita are island nations: Bermuda, Cayman Islands, and Iceland.
 
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  Results from FactBites:
 
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.
  More results at FactBites »


 

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