tryptic soy-serum-bacitracin-vancomycin tryptic soy-serum-bacitracin-vancomycin tsbv is the acronym for tryptic soy-serum-bacitracin-vancomycin, a type of agar plate medium used in microbiological testing to select for aggregatibacter actinomycetemcomitans (a.a.). it was described by jørgen slots in 1982, who also discovered the role of a.a. in periodontitis. per liter, tsbv contains: 40 g tryptic soy agar 1 g yeast extract 100 ml horse serum 75 mg bacitracin 5 mg vancomycin