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Investigation of an Outbreak of Variant Influenza A(H3N2) Virus Infection Associated With an Agricultural Fair-Ohio, August 2012. 2015
Adena Greenbaum, and
Celia Quinn, and
Jennifer Bailer, and
Su Su, and
Fiona Havers, and
Lizette O Durand, and
Victoria Jiang, and
Shannon Page, and
Jeremy Budd, and
Michael Shaw, and
Matthew Biggerstaff, and
Sietske de Fijter, and
Kathleen Smith, and
Carrie Reed, and
Scott Epperson, and
Lynnette Brammer, and
Dave Feltz, and
Kevin Sohner, and
Jared Ford, and
Seema Jain, and
Paul Gargiullo, and
Edward Weiss, and
Pat Burg, and
Mary DiOrio, and
Brian Fowler, and
Lyn Finelli, and
Michael A Jhung
Epidemic Intelligence Service Influenza Division.
BACKGROUND In 2012, one third of cases in a multistate outbreak of variant influenza A(H3N2) virus ([H3N2]v) infection occurred in Ohio. We conducted an investigation of (H3N2)v cases associated with agricultural Fair A in Ohio. METHODS We surveyed Fair A swine exhibitors and their household members. Confirmed cases had influenza-like illness (ILI) and a positive laboratory test for (H3N2)v, and probable cases had ILI. We calculated attack rates. We determined risk factors for infection, using multivariable log-binomial regression. RESULTS We identified 20 confirmed and 94 probable cases associated with Fair A. Among 114 cases, the median age was 10 years, there were no hospitalizations or deaths, and 82% had swine exposure. In the exhibitor household cohort of 359 persons (83 households), we identified 6 confirmed cases (2%) and 40 probable cases (11%). An age of <10 years was a significant risk factor (P < .01) for illness. One instance of likely human-to-human transmission was identified. CONCLUSIONS In this (H3N2)v outbreak, no evidence of sustained human-to-human (H3N2)v transmission was found. Our risk factor analysis contributed to the development of the recommendation that people at increased risk of influenza-associated complications, including children aged <5 years, avoid swine barns at fairs during the 2012 fair season.
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Celia Quinn, and
Jennifer Bailer, and
Su Su, and
Fiona Havers, and
Lizette O Durand, and
Victoria Jiang, and
Shannon Page, and
Jeremy Budd, and
Michael Shaw, and
Matthew Biggerstaff, and
Sietske de Fijter, and
Kathleen Smith, and
Carrie Reed, and
Scott Epperson, and
Lynnette Brammer, and
Dave Feltz, and
Kevin Sohner, and
Jared Ford, and
Seema Jain, and
Paul Gargiullo, and
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