Standard microbiology references describe Stenotrophomonas maltophilia as oxidase negative and variable with respect to utilization of lactose and sucrose. Analysis of a collection of 766 S. maltophilia isolates indicated that approximately 20 are oxidase positive and that this species should be reevaluated for other phenotypes, including oxidative fermentation of lactose and sucrose.
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Department of Pediatrics and Communicable Disease, University of Michigan Medical School, 8323 MSRB III, SPC 5646, 1150 W. Medical Center Dr., Ann Arbor, MI 48109.;
