Caring for Thomas Eric Duncan, the Dallas Ebola patient, may cost as much as $500,000, a bill that his hospital is unlikely to ever collect. Duncan is in critical condition at Texas Health Presbyterian Hospital Dallas, where he has been isolated since Sept. 28. He’s on a ventilator, has been given an experimental medicine and is receiving kidney dialysis, a hospital spokeswoman said Tuesday. His treatment probably includes fluids replacement, blood transfusions and drugs to maintain blood pressure. There’s also the cost of security, disposing of Ebola-contaminated trash and equipment to protect caregivers. The bill may eventually total $500,000 including indirect costs such as the disruption to other areas of hospital care, said Dan Mendelson, chief executive officer of Avalere Health, a Washington consulting firm. Duncan’s care probably costs $18,000 to $24,000 a day, said Gerard Anderson, a health policy professor at Johns Hopkins University’s Bloomberg School of Public Health.