source: The Republican (Danville, Indiana) - issue of Thursday, August 17, 1950 - page 1, column 2:
FIRST POLIO CASE
Mary Jane, 3-year-old daughter of Mr. and Mrs. James Williams, was taken to the Riley Hospital Sunday where it is reported she is suffering from polio. The child became ill last week and complained of a weakness in her legs. Mr. Williams is employed at the E.J. Roberts garage and the family live on the Robert Keller farm.