A method of detecting and/or specifically identifying bacteria producing OXA-048-type carbapenemase in a biological sample, includes the steps of: (a) placing the biological sample likely to contain the bacteria in contact with a reaction medium including at least one chromogenic substrate to detect an enzymatic activity, and temocillin at a concentration equal to or greater than 150 mg/L, preferably between 200 and 500 mg/L, (b) incubating the sample in the medium to allow the bacteria to grow, and (c) detecting the strains corresponding to the OXA-48 carbapenemase producing bacteria. A culture medium as implemented in step (a) is also provided.