Mycoplasma haemofelis (formerly
Haemobartonella felis) is a
gram negative epierythrocytic parasitic
bacterium. It often appears in bloodsmears as small (0.6µM)
coccoid bodies, sometimes forming short chains of 3 to 6 organisms. It is usually the causative agent of
Feline Infectious Anemia (FIA) in the United States.