Table 3.
Relative Densities of Amblyomma americanum and Ixodes scapularis in Select States
| State | Number of sampling sites | Average A. americanum density (ticks per 1000 m2) | Average I. scapularis density (ticks per 1000 m2) | Incidence of Lyme disease (cases per 100,000) |
|---|---|---|---|---|
| Massachusetts |
1 |
0 |
6 |
36.3 |
| New York |
1 |
0 |
5.8 |
12.3 |
| Minnesota |
2 |
0 |
8.13 |
24.4 |
| Wisconsin |
3 |
0 |
7.0 |
44 |
| Maryland |
1 |
10.33 |
4.67 |
20.1 |
| Virginia |
1 |
7.6 |
1.40 |
11.4 |
| North Carolina |
2 |
8.92 |
0 |
0.2 |
| South Carolina |
2 |
8.25 |
0.25 |
0.4 |
| Georgia |
2 |
11.67 |
0.8 |
0.1 |
| Kentucky |
2 |
11 |
0 |
0.1 |
| Missouri |
4 |
10.75 |
0.5 |
0.1 |
| Arkansas |
1 |
7 |
0 |
0 |
| Louisiana |
1 |
7.33 |
0 |
0 |
| Oklahoma | 4 | 10.98 | 0.26 | 0 |
Tick data were collected during summer months (May–August) in 2004 and represent all nymphal and adult individuals detected during sampling. Sites were sampled between one and six times per year (mean=3.26, standard deviation [SD]=1.63); densities were first averaged across sampling sessions by site, and then across sites by state Centers for Disease Control and Prevention 2005–2010; Duik-Wasser et al. 2006; Duik-Wasser, et al. unpublished data 2006.)
Sample inclusion methodology:
- • Five independent transects must have been sampled during each 1- to 2-day site visit;
- • Numbers of adult and nymphal ticks were summed across transects during each visit;
- • Numbers of ticks were averaged for each site across the number of site visits;
- • Density estimates for each site were averaged within a state;
- • Data from only 2004 were included.