Monthly CDC report counts for Ehrlichia chaffeensis ehrlichiosis aggregated across all available years.
Cases peak in June — about 1,841 cases reported.
| Month | Cases |
|---|---|
| Jan | 62 |
| Feb | 56 |
| Mar | 129 |
| Apr | 334 |
| May | 1,081 |
| Jun | 1,841 |
| Jul | 1,484 |
| Aug | 801 |
| Sep | 534 |
| Oct | 248 |
| Nov | 152 |
| Dec | 78 |