Mycoplasma are generally small (0.3 to 0.8 micrometers), gram negative, mostly facultative anaerobic, pleomorphic bacteria that lack cell walls, rendering them resistant to common antibiotics. Mycoplasma bovis is one of the most pathogenic species to affect cattle and the most frequent cause of bovine mastitis. Other conditions caused by M. bovis include arthritis, pneumonia, meningitis, otitis media, kerato-conjunctivitis, decubital abscesses, vaginitis, synovitis, and genital conditions. to learn more about Mycoplasma, follow this link: http://acceleratingscience.com/food/fact-sheet-on-mycoplasma-mastitis/