Cary-Blair Medium is recommended for the collection and transport of fecal and rectal samples, maintaining viability of Salmonella and Shigella in fecal samples. This medium has a low oxidation/reduction potential, which assures bacterial survival for long periods of time. Cary-Blair Medium has a low nutrient content and a phosphate buffer, together with the Sodium thioglycollate, that inhibit the massive growth of strains such as Escherichia coli and Klebsiella aerogenes. Agar Nº2 is the solidifying agent. Due to its high pH, Cary-Blair Medium has been described as especially good for epidemiological studies of Vibrio parahemolyticus, allowing long-term survival (up to 35 days at temperatures from 22 - 31°C) of rectal swabs. Long recovery times have been reported for Pasteurella pestis (75 days) as well as for Salmonellae and Shigellae (49 days). Cotton swabs placed at the bottom of the transport medium tube are used for the collection of the samples.
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