[The results of a comparative study of different series of commercial casein-carbon agar].

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.

[A comparative study of nutrient media for isolating Corynebacterium diphtheriae].

The diagnostic characteristics of 8 nutrient media most frequently employed at practical bacteriologic laboratories for the isolation of C. diphtheriae have been under study. Clauberg-2 medium and blood-tellurite agar have been found the most suitable for the diagnostic studies.

[Comparative study of nutrient media for isolation of the agents of pertussis and parapertussis].

Taking into consideration literature data pointing to a possibility of a marked improvement of the quality of the medium for the isolation of the causative agents of pertussis and parapertussis, an experimental study was made of the sensitivity of the nutrient media produced by the Dagestan Institute of Nutrient Media, a medium made from dry and also of a number of media modified by the authors prepared on its basis. Pure freshly-isolated and museum B. pertussis cultures were used in the observations.