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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)

Main Article

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.

Main Article

Page created: November 21, 2012
Page updated: November 21, 2012
Page reviewed: November 21, 2012
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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