A single basal growth medium for receiving various substrates for the purpose of rapid identification of any species of non- fermentative Gram- negative bacilli (NFB), wherein the medium is low in organic nitrogen but is supplemented with inorganic nitrogen from an ammonium ion source to enhance NFB growth. The medium also serves to identify members of the family Enterobacteriaceae, cytochrome oxidase positive fermenters, Gram- positive bacilli, Gram-positive cocci, and anaerobes.
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