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Volume 12, Number 6—June 2006

Dispatch

Preventing Zoonotic Influenza Virus Infection

Alejandro Ramirez*†Comments to Author , Ana W. Capuano*, Debbie A. Wellman*, Kelly A. Lesher*, Sharon F. Setterquist*, and Gregory C. Gray*
Author affiliations: *University of Iowa College of Public Health, Iowa City, Iowa, USA; †Iowa State University College of Veterinary Medicine, Ames, Iowa, USA

Main Article

Table 1

Characteristics of swine workers and controls, Iowa, 2004–2005

Variable Total Study sample, n (%)
Swine workers (n = 49) Controls (n = 79)*
Age group (y)
<29 46 15 (30.6) 31 (39.2)
29–42 40 12 (24.5) 28 (35.4)
>42 42 22 (44.9) 20 (25.3)
Mean age (y) 40.3 35.3
Sex†
Male 63 37 (75.5) 26 (32.9)
Female 65 12 (24.5) 53 (67.1)
Race†
American Indian/Alaska Native 1 0 1 (1.3)
Asian 2 1 (2) 1 (1.3)
African American 18 0 18 (22.8)
Native Hawaiian/Other Pacific Islander 2 0 2 (2.5)
White 105 48 (98) 57 (72.2)
Ethnicity†
Hispanic/Latino 12 10 (21.7) 2 (2.5)
Non-Hispanic/Latino 113 36 (78.3) 77 (97.5)
Served in military
Yes 12 5 (10.4) 7 (8.9)
No 115 43 (89.6) 72 (91.1)
Take medications that weaken immune system
Yes 3 2 (4.2) 1 (1.3)
No 122 44 (91.7) 78 (98.7)
Do not know 2 2 (4.2) 0 (0)
Have heart or vascular disease
Yes 3 2 (4.2) 1 (1.3)
No 124 46 (95.8) 78 (98.7)
Have any chronic lung problems such as asthma or emphysema
Yes 5 2 (4.2) 3 (3.8)
No 122 46 (95.8) 76 (96.2)
Received the 2001–02 influenza vaccine
Yes 37 6 (12.5) 31 (39.2)
No 90 42 (87.5) 48 (60.8)
Received the 2002–03 influenza vaccine†
Yes 36 5 (10.4) 31 (39.2)
No 91 43 (89.6) 48 (60.8)
Received the 2003–04 influenza vaccine†
Yes 43 8 (16.7) 35 (44.3)
No 84 40 (83.3) 44 (55.7)
Received the 1976–77 influenza vaccine†
Yes 2 1 (2.1) 1 (1.3)
No 119 41 (85.4) 78 (98.7)
Do not know 6 6 (12.5) 0
Smoked >5 packs of cigarettes in past year†
Yes 14 9 (18.4) 5 (6.3)
No 114 40 (81.6) 74 (93.7)

*Not exposed to swine.
†Significantly different than controls at α = 0.05.

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