H. Plyori often goes hand in hand with Celiac Disease, too, so often there can be a few things that need correcting...sometimes it is a long process of fixing one thing, then another, then another. You can have Celiac Antibodies and Pernicious anemia antibodies (I had neither, but have improved gluten free).
Genes with pernicious anemia?? Check out these articles. Some mention PA, some mention celiac disease, and several other autoimmune disorders....linked together as 'syndromes'.
Cara