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Recap: The X Files S 07 E 06 The Goldberg Variation
AB Negative: Richie has a rare blood type, B-negative. And he's CMV negative. Cytomegalovirus, as Scully says.
Billy Needs An Organ: Richie has a hepatitis and he needs liver transplant. (Scully diagnosed him just by looking at him.) Alternatively, he could get in a special experimental treatment program in England. He's got a rare blood type and further complications.