Hafnia (bacterium)

Hafnia is the genus of the Enterobacteriaceae family whose only species is the Gram-negative, facultatively anaerobic, rod-shaped bacterium Hafnia alvei.

H. alvei is a commensal of the human gastrointestinal tract and not normally pathogenic, but may cause disease in immunocompromised patients. It is often resistant to multiple antibiotics, including the aminopenicillins.