*These data are provisional and may be revised or adjusted in the future.
Cumulative Human Disease Cases by County - Illinois, 2005
| Carroll County | 1 |
| Christian County | 1 |
| Cook County | 134 |
| Dupage County | 47 |
| Kane County | 18 |
| Kankakee County | 3 |
| Kendall County | 3 |
| La Salle County | 1 |
| Lake County | 11 |
| Marshall County | 1 |
| McHenry County | 3 |
| McLean County | 4 |
| Morgan County | 1 |
| Peoria County | 7 |
| Rock Island County | 2 |
| Saint Clair County | 2 |
| Sangamon County | 1 |
| Schuyler County | 1 |
| Warren County | 1 |
| Will County | 8 |
| Winnebago County | 2 |
Cumulative Total Entire State: 252