Nancy A. Ryan-Wenger

When there was a change in her father’s behavior, Belva Tibbs feared what the diagnosis could be. David Denmark, 91, had suddenly begun hallucinating, says his wife, Reba, also 91. Reba and Belva suspected that dementia was the cause of David’s new symptoms and behavior changes.

Test developed at The Ohio State University examines how immune cells react to common challenges during pregnancy