Volume 24, Number 6—June 2018
Research
Influenza D Virus Infection in Feral Swine Populations, United States
Table 2
Seroprevalence of influenza D virus among 256 feral swine, by age group and sex, Hawaii, North Carolina, Oklahoma, and Texas, United States, October 1, 2012–September 30, 2013*
Characteristic, no. samples | D/13N |
D/46N |
Total seropositive swine, no. (%) | |||
---|---|---|---|---|---|---|
Seropositive swine, no. (%) | GMT (range) | Seropositive swine, no. (%) | GMT (range) | |||
Age | ||||||
Juvenile, n = 32 | 6 (18.8) | 63.5 (1:40–1:160) | 1 (3.1) | 80.0 (1:80–1:80) | 7 (21.9) | |
Subadult, n = 43 | 6 (14.0) | 40.0 (1:40–1:40) | 2 (4.7) | 40.0 (1:40–1:40) | 8 (18.6) | |
Adult, n = 181 |
27 (14.9) |
65.1 (1:40–1:160) |
15 (8.3) |
58.8 (1:40–1:160) |
34 (18.8) |
|
Sex | ||||||
F, n = 135 | 23 (17.0) | 62.9 (1:40–1:160) | 10 (7.4) | 54.0 (1:40–1:160) | 28 (20.7) | |
M, n = 118 | 16 (13.6) | 56.6 (1:40–1:160) | 8 (6.8) | 61. 7 (1:40–1:160) | 21 (17.8) |
*D/13N and D/46N were used in HAI assays with 0.5% turkey red blood cells. Seropositivity defined as HAI titer >1:40. Sex unknown for 3 animals. 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.
1These authors contributed equally to this article.
2Current affiliation: South China Agricultural University, Guangzhou, China.