Synergizing host factors (including obesity-unadjusted dosing and existing inflammation) marked this severe post-IVIG hemolytic crisis. Group A antigen restriction to myeloid tissues, with H Secretor phenotype, may have contributed, rendering this bone marrow transplant chimera vulnerable to anti-A in a manner analogous to the idiosyncratic effect of therapeutic anti-D in certain D+ ITP recipients. However, MMA suggested a macrophage activation state as contributory, perhaps precipitated by existing inflammation.
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