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PPD
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[[File:Mantoux tuberculin skin test.jpg|300px|thumb|left|''"PleasedonPlease don'tbepositive pleasedont be positive please don'tbepositive pleasedontt be positive please don'bepositivet be positive..."'']]
'''PPD''' (or '''purified protein derivative''') is a highly-purified tuberculin preparation used in yearly skin test medical providers get, after which they pray and they pray that they didn't catch TB.<ref>[http://gomerblog.com/2016/07/physician-gives-herself-tuberculosis-so-she-doesnt-have-to-get-any-more-flippin-ppds/ Physician Gives Herself Tuberculosis so She Doesn’t Have to Get Any More Flippin' PPDs]</ref>
