Volume 20, Number 9—September 2014
Research
Swine-to-Human Transmission of Influenza A(H3N2) Virus at Agricultural Fairs, Ohio, USA, 2012
Andrew S. Bowman
, Sarah W. Nelson, Shannon L. Page, Jacqueline M. Nolting, Mary L. Killian, Srinand Sreevatsan, and Richard D. Slemons
, Sarah W. Nelson, Shannon L. Page, Jacqueline M. Nolting, Mary L. Killian, Srinand Sreevatsan, and Richard D. Slemons
Table 1
Influenza A virus–specific results, 40 agricultural fairs, Ohio, USA, 2012*
| Fair | Week of fair season | Length of swine exhibition, d | ILI among swine reported | No. swine sampled | Positive by rRT-PCR, no. (%) | Positive by VI, no. (%) | Virus subtypes recovered | Associated with H3N2v in humans |
|---|---|---|---|---|---|---|---|---|
| A | 1 | 5 | Yes | 20 | 14 (70) | 5 (25) | H1N1pM and H3N2pM | No |
| B | 4 | 5 | No | 20 | 13 (65) | 9 (45) | H3N2pM | No |
| C | 6 | 4 | No | 20 | 6 (30) | 6 (30) | H3N2pM | No |
| D | 7 | 7 | No | 34 | 31 (91) | 29 (85) | H3N2pM | Yes |
| E | 7 | 5 | Yes | 40 | 39 (98) | 28 (70) | H3N2pM | Yes |
| F | 8 | 5 | No | 20 | 20 (100) | 18 (90) | H3N2pM | Yes |
| G | 8 | 7 | Yes | 20 | 14 (70) | 16 (80) | H3N2pM | Yes |
| H | 8 | 6 | No | 20 | 20 (100) | 18 (90) | H3N2pM | Yes |
| I | 9 | 4 | No | 20 | 17 (85) | 15 (75) | H3N2pM | Yes |
| J | 10 | 4 | Yes | 20 | 20 (100) | 17 (85) | H3N2pM | Yes |
| 30 other fairs | NA | NA | 600 | 29 (5) | 0 | NA | No | |
| Totals | NA | NA | 834 | 223 (27) | 161 (19) | NA | NA |
*Real-time reverse transcription PCR (rRT-PCR) and virus isolation (VI) assays performed on nasal swab samples collected from swine at the end of the fairs. Additional details (week of the fair season, clinical signs of influenza-like illness [ILI], and influenza A virus subtypes) are shown for 10 agricultural fairs from which influenza A virus was isolated from >1 pig. Pigs at the other 30 fairs were negative for influenza A virus by VI. NA, not applicable.
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