The state Department of Public Health announced Monday that it has received an additional 6,000 doses of mumps vaccine from Ohio and is distributing them to four regions affected most by the disease. The four regions are Rockford, Peoria, Champaign and West Chicago. Dean Schott, a department spokesman, said those communities are suffering the highest number of mumps cases of the 2,661 cases reported in Illinois this year. That number compares with cases last year in the state of only 292. Schott noted that Illinois accounts for more than half the number of mumps cases reported nationwide this year. The department was charged $4.84 each for the additional doses received from Ohio, at a total of $29,040. Schott said most of the mumps cases reported involve people between ages 11 and 15.