Hi,
I am looking for a company or an organizion that supplies PPD.
PPD stands for (I believe) Purified Protein Derivate and we use it
in an antigen presentation test as a positive control antigen.
About 10 years ago Sanbio (in Uden, the Netherlands) was our source, but now
nobody seems to know anything about it.
Any suggestion, also about an alternative antigen is welcome
Kees
