This higher prevalence of CMhm carriage compared to the other haemoplasma species could be due to the lack of symptoms in these cats thus possibly allowing propagation and spread of the agent. Transmission between cats has been suggested, but not definitely demonstrated, to occur through biting wounds and from mother to offspring. Also haemoplasma DNA has been detected in the cat flea Ctenocephalides felis and ticks [12, 24]. Furthermore, these asymptomatic cats may impose a risk with the increased use of feline blood for transfusion. The only case of Mhf infection showed signs of haemoplasmosis with major haematological changes with a marked decreased erythrocyte count, and abnormal haemoglobin and haematocrit values. Furthermore the cat had an increased reticulocyte count and presence of nucleated erythrocytes. These findings supports the current view that Mhf is the most pathogenic species, and the one most often found associated with clinical disease .