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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 1

Seroprevalence and PCR prevalence of Anaplasma phagocytophilum among small mammal species, northern and central coastal California*

Mammal species A. phagocytophilum IFA
A. phagocytophilum msp2 PCR
Seropositive Seroprevalence 95% CI PCR positive PCR prevalence 95% CI
Clethrionomys californicus 1 12.50 0.6–53.3 0 0 0–53.7
Glaucomys sabrinus 2 14.29 2.5–43.9 1 16.7 0.8–63.5
Mus musculus 0 0.00 0–25.3 0 0 0–34.4
Microtus californicus 2 5.88 1.0–21.1 0 0 0–17.8
Neotoma cinerea 0 0.00 0–94.5 0 0 0–94.5
N. fuscipes 167 50.15 44.7–55.6 8 4.3 2.0–8.6
N. macrotis 2 3.03 5.3–11.5 1 1.8 0.09–10.6
All Neotoma 169 42.25 37.4–47.3 9 3.7 1.8–7.1
Peromyscus boylii 3 8.82 2.3–24.8 1 4.0 0.2–22.3
P. californicus 2 0.67 0.1–2.7 0 0 0–3.8
P. maniculatus 18 3.46 2.1–5.5 0 0 0–6.6
P. truei 1 2.56 0.1–15.1 NT
Peromyscus spp. 0 0.00 0–53.7 NT
All Peromyscus 24 2.68 1.8–4.0 1 0.45 0.02–2.9
Rattus rattus 0 0.00 0–37 0 0 0–37.1
Reithrodontomys megalotis 0 0.00 0–17.2 1 6.3 0.3–32.3
Spermophilus beecheyi 0 0.00 0–4.2 0 0 0–20.0
S. lateralis 2 22.22 3.9–59.9 NT
Sciurus carolinensis 11 57.89 34.0–78.9 3 18.8 5.0–46.3
S. griseus 34 70.83 55.7–82.6 6 15.8 6.6–31.9
S. niger 1 100.00 55.0–100.0 0 0 0–94.5
All Sciurus 46 47.83 33.1–62.9 9 16.4 8.2–29.3
Sorex spp. 0 0.00 0–37.0 0 0 0–94.5
Sylvilagus bachmani 0 0.00 0–94.5 NT
Tamias amoenus 6 6.82 2.8–14.8 NT
T. merriami 0 0.00 0–48.3 0 0 0–40.2
T. minimus 0 0.00 0–4.9 NT
T. senex 5 4.81 1.8–11.4 NT
T. speciosus 4 33.33 11.3–64.6 NT
T. sonomae 1 14.29 0.7–58.0 2 50.0 15.0–85.0
T. ochrogenys 30 27.52 19.6–37.0 2 6.9 1.2–24.2
Tamias spp. 2 8.33 1.5–28.5 NT
All Tamias 48 13.45 10.2–17.5 4 34.0 3.2–24.1
Tamiasciurus douglasii
6
40.00
17.5–67.1

0
0
0–60.4
Total 300 15.24 13.7–16.9 33 3.8 2.9–5.3

*IFA, immunofluorescence assay; CI, confidence interval; NT, not tested.

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