Differentiation of S. maltophilia and Burkholderia cepacia is best accomplished by:
a. the oxidase test.
b. maltose and glucose medium.
c. tyrosine-enriched heart infusion agar.
d. nitrate reduction.
A
S. maltophilia can produce biochemical profiles similar to those of B. cepacia, but a negative oxidase test most often rules out the latter. S. maltophilia also oxidizes maltose faster than glu-cose and produces a brown pigment on heart infusion agar that contains tyrosine.
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