The most common immune-mediated blood disorders in small animal patients are immune-mediated thrombocytopenia (IMT) and immune-mediated hemolytic anemia (IMHA). Less common disorders that may have an immune-mediated component include pure red cell aplasia (PRCA), aplastic anemia, amegakaryocytic thrombocytopenia and steroid-responsive neutropenia. Immune-mediated blood disorders can be either primary (idiopathic) or secondary. As a general rule, these disorders in dogs are most commonly primary, whereas in cats they are more likely to be secondary. Since treatment of DVIHA and IMT has more similarities than differences, most therapeutic approaches apply equally well to both disorders.
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