Table 1. Seroprevalence of influenza D virus among 256 feral swine, by state, United States, October 1, 2012–September 30, 2013*.
| State, no. samples | D/13N |
D/46N |
Total seropositive swine, no. (%) | |||
|---|---|---|---|---|---|---|
| Seropositive swine, no. (%) | GMT (range) | Seropositive swine, no. (%) | GMT (range) | |||
| Hawaii, n = 73 | 11 (16.4) | 53.4 (1:40–1:80) | 4 (5.5) | 67.3 (1:40–1:80) | 15 (20.5) | |
| North Carolina, n = 64 | 4 (6.3) | 67.3 (1:40–1:160) | 3 (4.7) | 40 (1:40–1:40) | 5 (7.8) | |
| Oklahoma, n = 49 | 13 (26.5) | 49.5 (1:40–1:80) | 3 (6.1) | 50.4 (1:40–1:80) | 14 (28.6) | |
| Texas, n = 70 | 10 (14.3) | 85.7 (1:40–1:160) | 8 (11.4) | 63.5 (1:40–1:160) | 15 (21.4) | |
*D/13N and D/46N were used in HAI assays with 0.5% turkey red blood cells. Seropositivity defined as HAI titer >1:40. D/13N, influenza D/bovine/C00013N/Mississippi/2014 virus; D/46N, influenza D/bovine/C00046N/Mississippi/2014 virus; GMT, geometric mean titer; HAI, hemagglutination inhibition.