Mycoplasma agalactiae

Mycoplasma agalactiae is a species of bacteria in the genus Mycoplasma. This genus of bacteria lacks a cell wall around their cell membrane. Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis. Mycoplasma are the smallest bacterial cells yet discovered, can survive without oxygen and are typically about 0.1–0.3 μm in diameter.

It is the main agent of contagious agalactia, a syndrome causing clinical signs of mastitis, conjunctivitis, and arthritis in small ruminants. It can be present in their milk. At least eleven strains of this species have been characterized. In serious outbreaks with infections with this pathogen, whole herds have been lost.

The type strain is strain PG2 = CIP 59.7 = NCTC 10123.