Volume 13, Number 4—April 2007
Dispatch
Human Babesia microti Incidence and Ixodes scapularis Distribution, Rhode Island, 1998–2004
Sarah E. Rodgers*1 and Thomas N. Mather*
Table
Coefficients of simple logistic regression of Ixodes scapularis nymphs collected per hour, Rhode Island, USA
| Year | Intercept | Slope | No. nymphs/h* |
|---|---|---|---|
| 1998 | −4.610 | 0.024 | 135 |
| 1999 | −5.671 | 0.078 | 55 |
| 2000 | −3.474 | 0.040 | 52 |
| 2001 | −3.859 | 0.024 | 102 |
| 2002 | −4.106 | 0.093 | 30 |
| 2003 | −3.529 | 0.079 | 27 |
| 2004 | −2.566 | 0.064 | 19 |
*Minimum no. nymphs that must be collected per hour to create a medium-high risk for babesiosis (20% probability of ≥1 case of human babesiosis per census tract).
