Disease Associated with Immune System
A selective IgA deficiency would be expected to result in problems with

mucosal pathogens
pathogens which can survive inside macrophages
infections following dental work due to bacteria entering the bloodstream
bacterial infections

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Disease Associated with Immune System
Bone marrow given to an infant with SCID must

come from a donor that shares some MHC alleles with the recipient
come from one of the child's parents
be irradiated to eliminate GVHD
contain mature T cells that can begin making immune responses immediately

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