Mycoplasma agalactiae is a species of bacteria in the genus Mycoplasma. This genus of bacteria lacks a cell wall around their cell membrane.[1] Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis.[2] Mycoplasma are the smallest bacterial cells yet discovered, can survive without oxygen and are typically about 0.1–0.3 μm in diameter.[3]
It is the main agent of contagious agalactia, a syndrome causing clinical signs of mastitis, conjunctivitis, and arthritis in small ruminants.[4] It can be present in their milk.[5][6] At least eleven strains of this species have been characterized.[7] In serious outbreaks with infections with this pathogen, whole herds have been lost.[8]
The type strain is strain PG2 = CIP 59.7 = NCTC 10123.[9]