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Volume 18, Number 12—December 2012

Research

Outbreak of Influenza A (H3N2) Variant Virus Infection among Attendees of an Agricultural Fair, Pennsylvania, USA, 2011

Karen K. WongComments to Author , Adena Greenbaum, Maria E. Moll, James Lando, Erin L. Moore, Rahul Ganatra, Matthew Biggerstaff, Eugene Lam, Erica E. Smith, Aaron D. Storms, Jeffrey R. Miller, Virginia Dato, Kumar Nalluswami, Atmaram Nambiar, Sharon A. Silvestri, James R. Lute, Stephen Ostroff, Kathy Hancock, Alicia Branch, Susan C. Trock, Alexander Klimov, Bo Shu, Lynnette Brammer, Scott Epperson, Lyn Finelli, and Michael A. Jhung
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (K.K. Wong, A. Greenbaum, R. Ganatra, M. Biggerstaff, E. Lam, A.D. Storms, J.R. Miller, K. Hancock, A. Branch, S.C. Trock, A. Klimov, B. Shu, L. Brammer, S. Epperson, L. Finelli, M.A. Jhung); Pennsylvania Department of Health, Harrisburg, Pennsylvania, USA (M.E. Moll, E.E. Smith, J.R. Miller, V. Dato, K. Nalluswami, A. Nambiar, J.R. Lute, S. Ostroff); Allegheny County Health Department, Pittsburgh, Pennsylvania (J. Lando, S.A. Silvestri); and Pennsylvania Department of Agriculture, Harrisburg (E.L. Moore)

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Table 4

Characteristics of Club X cohort members, by case status, who attended agricultural Fair A during an outbreak of A(H3N2)v virus infection, Pennsylvania, 2011*

Characteristic No. members, N = 127 No. (%) suspected cases RR† (95% CI)
Sex

M

47 5 (11)

F

80 9 (11)
Age, y

<4

2 0 (0)

4–13

70 7 (10)

14–18

51 7 (14)

>19

4 0 (0)
Underlying medical condition

No

105 14 (13)

Yes

19 0 (0)
Swine exposure‡

None

27 1 (4) Referent

Indirect

39 3 (8) 2.1 (0.2–53.4)

Direct

61 10 (16) 4.4 (0.8–116.3)
Exhibited swine

No

91 10 (11)

Yes

34 4 (12) 1.1 (0.2–3.2)
Family owns swine

No

92 7 (8)

Yes

33 7 (21) 2.8 (0.9–8.6)
Fed swine

No

78 7 (9)

Yes

37 7 (19) 2.1 (0.7–6.6)
Bathed swine

No

80 7 (9)

Yes

35 7 (20) 2.3 (0.7–7.1)
Cleaned swine pen

No

84 7 (8)

Yes

31 7 (23) 2.7 (0.8–8.3)

*Club X is an agricultural club for children. A(H3N2)v, influenza A (H3N2) variant virus. RR, relative risk.
†RR of suspected case status is reported for selected exposures.
‡Direct exposure defined as touching pigs; Indirect exposure defined as attending or walking near the pig exhibit.

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