Anemia associated with 'Candidatus Mycoplasma haemominutum' in a feline leukemia virus-negative cat with lymphoma

'Candidatus Mycoplasma haemominutum,' previously known as the small form of Haemobartonella felis (California species), is a hemotrophic parasite found on erythrocytes of infected cats. Although fleas are potential vectors, confirmatory studies are lacking. Healthy cats infected with 'Candidatus Mycoplasma haemominutum' generally do not have clinically significant anemia, but concurrent disease or immune suppression may predispose a cat to develop a life-threatening anemia, such as in the case reported here.