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Volume 14, Number 7—July 2008

Dispatch

Anaplasma phagocytophilum Infection in Small Mammal Hosts of Ixodes Ticks, Western United States

Janet E. Foley*Comments to Author , Nathan C. Nieto*, Jennifer Adjemian*, Haydee Dabritz†, and Richard N. Brown‡
Author affiliations: *University of California, Davis, California, USA; †California Department of Public Health, Richmond, California, USA; ‡Humboldt State University, Arcata, California, USA;

Main Article

Table 2

Regional seroprevelance and PCR prevalence rates for exposure to Anaplasma phagocytophilum in small mammals in various sites, northern and central California*

Site A. phagocytophilum IFA
A. phagocytophilum msp2 PCR
Seropositive Seroprevalence 95% CI PCR positive PCR prevalence 95% CI
Big Basin State Park 16 6.30 3.76–10.22 5 12.20 4.58–27.00
Humboldt Redwoods State Park 24 16.90 11.33–24.31 2 6.06 1.06–21.62
Hoopa Valley Indian Reservation 173 36.19 31.91–40.70 6 4.14 1.69–9.18
Hendy Woods State Park 43 22.51 16.93–29.22 5 12.19 4.58–27.00
King Range National Conservation Area 1 3.45 0.18–19.63 0 0.00 0.00–80.21
Mendocino County (roadside only) 0 0.00 0.00–94.53 0 0.00 0.00–94.54
Morro Bay regional communities 5 1.23 0.45–3.01 2 0.67 0.12–2.65
Placerville City region (roadside only) 1 1.00 5.46–1.00 1 1.00 5.46–1.00
Quincy City region (roadside only) 2 50.00 15.00–84.99 0 0.00 0.00–60.42
Sutter Buttes State Park 3 7.50 1.96–21.48 1 50.00 9.45–90.55
Sagehen Research Station 17 7.69 4.68–12.24 0 0.00 0.00–60.42
Siskiyou County (roadside only) 3 1.00 30.99–1.00 1 33.33 1.76–87.47
Sonoma 1 1.00 5.46–1.00 0 0.00 0.00–94.54
Samuel P. Taylor State Park 3 1.75 0.42–5.45 2 4.26 0.74–15.73
Trinity County (roadside only) 2 40.00 7.26–82.96 0 0.00 0.00–53.71
Sacramento River Valley (roadside only) 3 1.00 30.99–1.00 0 0.00 0.00–69.00
Willow Creek Town (roadside only) 3 0.30 8.09–64.63 0 0.00 0.00–60.42
Yolo County 1 6.67 0.35–33.97 0 0.00 0.00–25.35

*IFA, immunofluorescence assay; CI, confidence interval.

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