PPD

"Pleasedon'tbepositive pleasedon'tbepositive pleasedont'bepositive..."

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.^[1]

References

↑ Physician Gives Herself Tuberculosis so She Doesn’t Have to Get Any More Flippin' PPDs

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[1] Physician Gives Herself Tuberculosis so She Doesn’t Have to Get Any More Flippin' PPDs

[1]