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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 2

Characteristics of case-patients with confirmed or probable A(H3N2)v virus infection after attending an agricultural Fair A, Pennsylvania, 2011*

Case-patient no.,
case status Age group, y/sex Underlying condition Date(s) at fair† Date of illness onset‡ Symptoms Clinical outcome
1, confirmed <4/F No 3 7 Fever, cough, runny nose Visited clinic, recovered
2, confirmed 4–13/F No 0 to 7 11 Feverish, vomiting, abdominal pain Did not seek medical care, recovered
3, confirmed 4–13/F Yes 2 to 5 5 Fever, cough, dyspnea, vomiting, diarrhea Hospitalized, ICU (not mechanically ventilated), recovered
4, probable <4/M No 4 6 Fever, cough, runny nose, diarrhea Visited clinic, recovered
5, probable <4/F No 0 to 3, 5, 6 5 Fever, cough Did not seek medical care, recovered
6, probable <4/M No 6 12 Fever, cough, sore throat, runny nose Did not seek medical care, recovered
7, probable <4/F No −1§ to 2, 4, 5, 7 4 Feverish, cough Did not seek medical care, recovered

*Case-patients 1–7 visited the swine exhibit, and all except case-patient 4 also touched swine. Case-patient 2 exhibited swine with an agricultural club for children (Club X) and was not randomly selected for the cohort study. A(H3N2)v, influenza A (H3N2) variant virus; ICU, intensive care unit.
†Day 0 is the first day fair was open to the public.
‡Illness onset date represents number of days after fair was open to the public.
§Arrived at fairgrounds 1 day before fair was open to the public.

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