Pyelonephritis due to Brucella species: true clinical entity or ghost disease?

Brucellosis is a chronic granulomatous infection caused by intracellular Gram-negative bacteria belonging to Brucella species. While uncommon in the United States, northern Europe and Eastern Asia, it is common in the Middle East, southern Europe, and South America [1]. Human brucellosis is a potentially life-threatening multisystem disease which requires combined and prolonged treatment with antimicrobial agents.