TABLE 5

Agents detected in A. americanum and D. variabilis ticksa

Tick species and agentbNo. of positive ticks (% [95% CI])
SpringTotal
NorthSouth
Amblyomma americanumn = 352 (128 A/224 N)n = 324 (194 A/130 N)n = 676 (322 A/354 N)
    Borrelia lonestaric
        A1 (1 [0.05–6])5 (3 [1–8])6 (2 [1–5])
        N1 (0.5 [0.2–3])1 (1 [0.5–6])2 (0.6 [0.1–3])
    Ehrlichia chaffeensis
        A3 (2 [0.6–7])3 (1 [0.4–5])6 (2 [0.7–4])
        N1 (0.4 [0.2–3])1 (0.8 [0.4–5])2 (0.6 [0.1–2])
    Ehrlichia ewingii
        A8 (6 [3–12])4 (2 [0.7–5])12 (4 [2–6])
        N2 (1 [0.1–3])0 (0 [0–3])2 (0.6 [0.1–2])
    E. ruminantium-like species
        A2 (2 [0.3–6])3 (1 [0.4–5])5 (1 [0.6–4])
        N0 (0 [0–2])0 (0 [0–3])0 (0 [0–1])
    Total Ehrlichia spp.
        A13 (10 [6–17])10 (5 [3–9])23 (7 [5–11])
        N3 (1 [0.3–4])1 (0.8 [0.4–5])4 (1 [0.4–3])
    Rickettsia amblyommatis
        A79 (62 [53–70])119 (61 [54–68])198 (61 [56–67])
        N111 (49 [43–56])85 (65 [56–73])196 (55 [50–60])
Dermacentor variabilisn = 124n = 172n = 296
    Rickettsia montanensis6 (5 [2–11])2 (1 [0.2–5])8 (3 [1–5])
  • a Values are means and 95% confidence intervals (CIs).

  • b A, adult; N, nymph.

  • c A total of 548 ticks were tested from the northern (102 adults, 210 nymphs) and southern (140 adults, 96 nymphs) regions of Suffolk County.