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Volume 18, Number 9—September 2012

Dispatch

Influenza A(H1N1)pdm09 Virus among Healthy Show Pigs, United States

Gregory C. GrayComments to Author , Jeffrey B. Bender, Carolyn B. Bridges, Russell F. Daly, Whitney S. Krueger, Michael J. Male, Gary L. Heil, John A. Friary, Robin B. Derby, and Nancy J. Cox
Author affiliations: University of Florida, Gainesville, Florida, USA (G.C. Gray, W.S. Krueger, G.L. Heil, J.A. Friary, R.B. Derby); University of Minnesota, St. Paul, Minnesota, USA (J.B. Bender); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (C.B. Bridges, N.J. Cox); South Dakota State University, Brookings, South Dakota, USA (R.F. Daly); and University of Iowa, Iowa City, Iowa, USA (M.J. Male)

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Table

Characteristics of 123 persons enrolled in study of influenza A virus among show pigs, Minnesota and South Dakota state fairs, 2008 and 2009

Characteristic No. (%)
State fair where enrolled

Minnesota

90 (73.2)

South Dakota

33 (26.8)
Year enrolled

2008

48 (39.0)

2009

75 (61.0)
Age group, y*

<8

29 (23.6)

18–39

37 (30.1)

40–59

46 (37.4)

>60

8 (6.5)
Sex*

M

86 (69.9)

F

35 (28.5)
Work performed in the last 30 d†

Unemployed

8 (6.5)

Farmer

108 (87.8)

Swine farmer

100 (81.3)

Government employee

8 (6.5)

Veterinarian/veterinary assistant

2 (1.6)
Receipt of vaccination for human influenza in past 2 y*

Yes

35 (28.5)

No

76 (61.8)

Unknown

7 (5.7)
Respiratory illness in past 12 mo*

Yes

64 (52.0)

No

55 (44.7)

Unknown

2 (1.6)
Worked with swine, y*

<1

3 (2.4)

>1–4

10 (8.1)

5–10

39 (31.7)

>10

50 (40.7)

*These covariates have missing data.
†Responses are not mutually exclusive.

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