needed to prevent overgrowth by yeast able to grow at 37ºC but not at
42ºC.
In 1993 Aspinall et al. developed a modification of mCCDA designed for
use at 37ºC to isolate C. upsaliensis as well as the other thermophilic
campylobacter species. This medium contains 8 mg/L cefoperazone
and 4 mg/L teicoplanin replacing 32 mg/L cefoperazone in mCCDA.
Teicoplanin has an antimicrobial spectrum similar to that of vancomycin,
active mainly against gram-positive bacteria. By comparison with mCCDA
the final formulation of this medium, called CAT Agar, isolated the same
numbers of Campylobacter spp other than C. upsaliensis from faeces
and is superior to mCCDA for C. upsaliensis with slightly higher growth of
competing microflora.