Table 4.
New cases of SFGR reported to NJ DOH by each NJ county in 2018*, average incidence (±SD) from 2010 to 2018 (per 100,000 residents) and prevalence of SFG Rickettsia–positive Dermacentor variabilis and SFG Rickettsia–positive Amblyomma americanum in New Jersey
| Dermacentor variabilis | Amblyomma americanum | |||||||
|---|---|---|---|---|---|---|---|---|
| County | SFGR | Average incidence ± SD | Number tested | Number positive | % Ticks positive | Number tested | Number positive | % Ticks positive |
| Atlantic | 14 | 4.2 ± 3.0 | 16 | 1 | 6.2 | 25 | 3 | 12.0 |
| Bergen | 6 | 0.3 ± 0.2 | 35 | 1 | 2.8 | NA | ||
| Burlington | 7 | 1.4 ± 0.9 | 6 | 1 | 16.6 | 39 | 3 | 7.7 |
| Camden | 4 | 0.9 ± 0.6 | 5 | 0 | 0 | 17 | 2 | 12.0 |
| Cape May | 1 | 2.3 ± 2.0 | 5 | 0 | 0 | 3 | 0 | 0 |
| Cumberland | 4 | 3.1 ± 2.4 | 4 | 0 | 0 | 30 | 2 | 6.7 |
| Essex | 4 | 0.4 ± 0.2 | 44 | 1 | 2.3 | NA | ||
| Gloucester | 12 | 3.1 ± 2.0 | 8 | 1 | 12.5 | 44 | 5 | 11.4 |
| Hudson | 1 | 0.2 ± 0.2 | 87 | 1 | 1.1 | NA | ||
| Hunterdon | 7 | 4.7 ± 4.3 | 26 | 0 | 0 | NA | ||
| Mercer | 3 | 0.4 ± 0.3 | 24 | 1 | 4.2 | NA | ||
| Middlesex | 6 | 0.5 ± 0.3 | 50 | 0 | 0 | 16 | 0 | 0 |
| Monmouth | 27 | 1.3 ± 1.3 | 153 | 2 | 1.3 | 2 | 1 | 50.0 |
| Morris | 3 | 0.4 ± 0.3 | 119 | 0 | 0 | NA | ||
| Ocean | 27 | 2.2 ± 1.3 | 178 | 2 | 1.1 | 65 | 32 | 49.2 |
| Passaic | 0 | 0.4 ± 0.3 | 13 | 0 | 0 | NA | ||
| Salem | 3 | 3.6 ± 2.2 | 13 | 0 | 0 | 3 | 1 | 33.3 |
| Somerset | 4 | 0.9 ± 0.7 | 54 | 0 | 0 | 1 | 0 | 0 |
| Sussex | 3 | 0.7 ± 0.8 | 27 | 1 | 2.7 | NA | ||
| Union | 6 | 0.6 ± 0.3 | 65 | 0 | 0 | NA | ||
| Warren | 2 | 0.8 ± 1.0 | 22 | 0 | 0 | NA | ||
| Total | 144 | 1.5 ± 2.0 | 954 | 12 | 245 | 49 | ||
All Rickettsia in Dermacentor variabilis were identified as Rickettsia montanensis and all Rickettsia in Amblyomma americanum were Rickettsia amblyommatis. “NA” indicates no ticks of this species were collected in that county.