Multiple choice

Cary Blair medium is used as a

  1. selective medium

  2. enriched medium

  3. differential medium

  4. transport medium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cary Blair medium is a transport medium for the collection and shipment of clinical specimens. The low nutrient content of the medium and the inclusion of phosphate buffer prevent bacterial overgrowth by E. coli, Citrobacter freundii and Klebsiella aerogenes. It can occur in other transport mediums containing sodium glycerophosphate. The low oxidation-reduction potential of the medium ensures bacterial survival over long periods.

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