[The results of a comparative study of different series of commercial casein-carbon agar]. / Rezul'taty sravnitel'nogo izucheniia razlichnykh serii kommercheskogo kazeinovo-uglo'nogo agara.

Comparative assessment of the diagnostic properties of 30 lots of commercial casein-carbon agar used in practical bacteriology for the diagnosis of pertussis has shown essential differences in the efficacies of various lots of this medium. Only 11 of the 30 tested lots provided the formation of B. pertussis colonies in the periods established by the instruction. Addition of antibiotics to the medium reduced its diagnostic characteristics still more.