Table 2.
Number of Confirmed and Probable CTF Cases and Average Annual Incidence per Million Population by County of Residence for Counties with More Than One Case:United States, 2002–2012
| CTF cases | ||
|---|---|---|
| County and state of residence | No. | Rate per million |
| Sublette, Wyominga | 16 | 141.9 |
| Missoula, Montana | 6 | 5.0 |
| Salt Lake, Utah | 5 | 0.4 |
| Big Horn, Montana | 4 | 28.3 |
| Wasatch, Utah | 4 | 15.5 |
| Ravalli, Montana | 4 | 9.0 |
| Deschutes, Oregon | 3 | 1.7 |
| Davis, Utah | 3 | 0.9 |
| Carbon, Wyoming | 2 | 11.4 |
| Multnomah, Oregon | 2 | 0.3 |
| Albany, Wyoming | 2 | 5.0 |
| Boulder, Colorado | 2 | 0.6 |
a
Active surveillance for Colorado tick fever (CTF) occurred in Sublette County, Wyoming, in 2009.