Mycoplasma suis is is an extracellular bacterial organism that attaches to and causes deformity and damage to porcine red blood cells. It has a restrictive cellular membrane, lacking organelles and nucleus. M. suis causes febrile acute icteroanemia in pigs, which is accompanied by high numbers of M. suis cells in the blood. Once pigs are infected with M. suis, they remain lifelong carrier animals and therefore are epidemiologically important. Chronic M. suis infections result in reproductive disorders in sows, growth retardation in piglets, and increased susceptibility to respiratory and enteric infections in feeder pigs.