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Volume 18, Number 12—December 2012

Research

Subclinical Influenza Virus A Infections in Pigs Exhibited at Agricultural Fairs, Ohio, USA, 2009–2011

Andrew S. BowmanComments to Author , Jacqueline M. Nolting, Sarah W. Nelson, and Richard D. Slemons
Author affiliations: The Ohio State University, Columbus, Ohio, USA

Main Article

Table 2

Frequency of influenza virus A isolation from individual pigs exhibited at agricultural fairs with >1 pig testing positive for influenza virus A, Ohio, USA, 2009–2011*

Fair No. pigs positive/no. tested (%)
2009 2010 2011
A 18/20 (80) 0/20 0/20
B 10/20 (50) 0/20 20/20 (100)
C 19/20 (90) 15/20 (75) 20/20 (100)†
D 0/20 1/20 (5)† 19/20 (95)
E 0/20 18/20 (90) 0/20
F 0/20 0/20 3/20 (15)
G 0/20 3/20 (15)
H 16/40 (40)

*Fair G did not participate in 2009; fair H did not participate in 2009 or 2010.
†Fairs where there were pigs with influenza-like illness.

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