By Steve Gust, For The OklahomanHealth care for the metro area’s American Indian population is improving, and a large part of that may be attributed to high rates of immunizations for American Indian children. Voicing that opinion is David Toahty, a development officer of the Oklahoma City Indian Clinic, 5208 W Reno. “A lot of what we do here is preventive medicine, and this is helping,” he said. That sentiment was echoed by Robyn Sunday-Allen, president and CEO of the clinic. “Immunization rates are closely monitored at the OKCIC.