Misidentification of as species: potential pitfalls in the diagnosis of brucellosis.

We describe a case of brucellosis in a man in his 20s, who presented to the emergency department with a 1-month history of fevers, dry cough and knee pain. Blood cultures were positive after 55 hours and was identified on matrix-assisted laser desorption/ionisation time of flight (MALDI-TOF) mass spectrometry. spp are Gram-negative organisms that are phylogenetically related to spp but commercially available MALDI-TOF libraries cannot distinguish between the two genera.