QUALITY CONTROL
Enterobacter aerogenes ATCC 13048: good growth,no change of color in the medium
Escherichia coli ATCC 25922: good growth,no change of color in the medium
Klebsiella pneumoniae ATCC 13883: good growth, red-purple color
Proteus vulgaris ATCC 13315: good growth, red-purple color
Salmonella typhimurium ATCC 14028: good growth, no change of color in the medium
To base medium add 20 ml urea solution 20% before solidification (cool to 45-50 °C).
At a pH of 6.8 to 7.0 the solidified medium should have a light pinkish yellow color.
COMPOSITION
Glucose ........................................................................1g
Peptone ........................................................................1g
KH
2PO4 .........................................................................2g
NaCl ..............................................................................5g
Phenol red ...........................................................0.012g
Agar ............................................................................20g
H
2O ad 1000 ml,  adjust pH to 6.8
DESCRIPTION
Medium used for differentiation of microorganisms, particularly enteric Gram-negative Enterobacteria, on the basis of urea hydrolysis.
Christensen Urea agar
(c) Costin Stoica
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