Volume 18, Number 12—December 2012
Research
Subclinical Influenza Virus A Infections in Pigs Exhibited at Agricultural Fairs, Ohio, USA, 2009–2011
Andrew S. Bowman
, Jacqueline M. Nolting, Sarah W. Nelson, and Richard D. Slemons
, Jacqueline M. Nolting, Sarah W. Nelson, and Richard D. Slemons
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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