Background
Listeria sp. are facultative intracellular bacterial pathogens, which pose a potential public health problem related to consumption of contaminated food. Human listeriosis is clinically classified as perinatal listeriosis, neonatal listeriosis and adult listeriosis. Human infections caused by Listeria sp. present typically as meningitis. Other infections attributed to Listeria sp. include endocarditis, myocarditis, arteritis, pneumonia, pleuritis, cholecystitis, peritonitis, arthritis, osteomyelitis, sinusitis, otitis, conjunctivitis and ophthalmitis. We report a case of breast abscess in a young lactating patient.