The treatment was simple — three pills a day, best taken on a full stomach — and it cured Gabriel Serna of hepatitis C in eight weeks. He just had to wait eight years to get it. In theory, revolutionary medications have made the blood-borne, sometimes-fatal infection curable, so people with the disease need not endure the inexorable and irreversible damage it causes to their livers. Unless they are in one of New Mexico’s prisons, like Serna was for much of his wait. That’s because although the state’s inmates have the highest prevalence of hepatitis C of any group in New Mexico — more than four in 10 are infected — the prisons are hardly treating any of them: Out of some 3,000 prisoners diagnosed with the disease, just 46 received treatment for hepatitis C during the 2018 fiscal year.