LAS VEGAS -- A Nevada jury ordered the state's largest health management organization on Tuesday to pay $500 million in punitive damages to three plaintiffs in a civil negligence lawsuit stemming from a Las Vegas hepatitis outbreak. Two companies - both subsidiaries of publicly traded UnitedHealth Group Inc. - signed a low-bid contract with the physician who ran the clinic where the outbreak started, despite warnings that he sped through procedures and pinched pennies at his clinics so much that patients were at risk of contracting blood-borne diseases, attorneys for those suing the companies argued.