Table 2. Prevalence of California serogroup viruses in wildlife in Canada, 2017, in study of widespread exposure to mosquitoborne California serogroup viruses in caribou, Arctic fox, red fox, and polar bears*.
| Species | Sample size | Test | Total prevalence, % (no./total) | Location | Regional prevalence, % (95% CI) (no./total) | Prevalence, serum, % (no./total) | Prevalence, whole blood, % (no./total) |
|---|---|---|---|---|---|---|---|
| Caribou |
517 |
cELISA |
63 (324/517) | BC | 45 (26–66) (9/20) | 45 | NA |
|
|
Yukon | 45 (37–53) (68/152) | 45 | NA | |||
| NT | 83 (78–88) (182/219) | 83 | NA | ||||
| Nunavut | 80 (69–87) (58/73) | 91 (49/54) | 47 (9/19) | ||||
| Nunavik |
13 (7–25) (7/53) |
NA |
13 |
||||
| Arctic fox |
297 |
cELISA |
4 (11/297) |
NT | 0 (0–6) (0/66) | NA | 0 |
| Nunavut | 4 (2–7) (8/221) | 5 (7/136) | 1 (1/85) | ||||
| Nunavik |
30 (11–60) (3/10) |
NA |
30 |
||||
| Red fox |
77 |
cELISA |
12 (9/77) |
NT | 0 (0–39) (0/6) | NA | 0 |
| Nunavik | 20 (6–51) (2/10) | NA | 20 | ||||
| South QC |
12 (6–22) (7/61) |
NA |
12 |
||||
| Polar bear |
377 |
cELISA |
28 (107/377) |
Manitoba |
28 (24–33) |
28 |
NA |
| Red-backed vole |
349 |
qPCR |
0 |
NT |
0 (0–1) |
NA |
NA |
| Meadow vole |
20 |
qPCR |
0 |
NT |
0 (0–16) |
NA |
NA |
| Deer mouse |
68 |
qPCR |
0 |
NT |
0 (0–5) |
NA |
NA |
| Collared lemming |
9 |
qPCR |
0 |
Nunavut |
0 (0–30) |
NA |
NA |
| Shrew, unidentified | 59 | qPCR | 0 | NT | 0 (0–6) | NA | NA |
*BC, British Columbia; MB, Manitoba; NA, not applicable; NT, Northwest Territories; QC, Québec; qPCR; quantitative PCR; cELISA, competitive ELISA.