Ok guys, First AID is tripping. In my 2014 addition, it says Bruton's agammaglobulinemia has decreased pro-B cells and NORMAL CD19 counts. I thought that pre-B would be HIGH in this disorder (since the block prevents maturation at the pre-B stage). Also, CD19 should be LOW (as was so elegantly indicated to me in UWorld today). Do you guys make sense of First Aid's explanation of Bruton?