Table 1.
Demographic characteristics of the population in a study of zoonotic influenza virus infection.
| Characteristic | Farmersa (n = 111) | Meat processing workers (n = 97) | Veterinarians (n = 65) | Control subjects (n = 79) |
|---|---|---|---|---|
| Sex | ||||
| Male | 61 (55)b | 52 (54)b | 50 (77)b | 26 (33) |
| Female | 50 (45) | 45 (46) | 15 (23) | 53 (67) |
| Age, years | ||||
| <25 | 1 (1) | 15 (15) | 2 (3) | 12 (15) |
| 25–39 | 11 (10) | 32 (33) | 11 (17) | 41 (52) |
| >39 | 99 (89) | 50 (52) | 52 (80) | 26 (33) |
| Age, mean years | 47.0b | 39.5b | 48.4b | 35.3 |
| Race/ethnicity | ||||
| White | 111 (100) | 96 (99) | 62 (97) | 57 (72) |
| Black | 0 (0) | 1 (1) | 2 (3) | 18 (23) |
| Hispanic | 0 (0) | 5 (5) | 1 (1) | 2 (3) |
| Asian | 0 (0) | 0 (0) | 0 (0) | 1 (1) |
| American Indian | 0 (0) | 0 (0) | 0 (0) | 1 (1) |
| Pacific Islander | 0 (0) | 0 (0) | 0 (0) | 1 (1) |
NOTE. Data are no. (%) of subjects, unless otherwise indicated.
a
Participants indicated they lived on a farm or worked on a farm for ≥10 each week in a leading swine–producing county. Individual swine exposure was not quantified.
b
Significantly different than controls at α = .05.