Volume 20, Number 9—September 2014
Research
Swine-to-Human Transmission of Influenza A(H3N2) Virus at Agricultural Fairs, Ohio, USA, 2012
, Sarah W. Nelson, Shannon L. Page, Jacqueline M. Nolting, Mary L. Killian, Srinand Sreevatsan, and Richard D. Slemons
Table 2
Genetic distances between influenza A(H3N2) viruses isolated from swine and humans at 10 agricultural fairs, Ohio, USA, 2012*
| Fair |
Fair A |
Fair B |
Fair C |
Fair D |
Fair E |
Fair F |
Fair G |
Fair H |
Fair I |
Fair J |
|---|---|---|---|---|---|---|---|---|---|---|
| Fair A | 4.00 | 3.38 | 3.51 | 6.74 | 5.59 | 5.30 | 7.76 | 5.00 | 7.10 | 7.42 |
| Fair B | 19.00 | 2.00 | 1.68 | 5.75 | 5.15 | 4.68 | 7.09 | 4.12 | 5.90 | 7.02 |
| Fair C | 17.50 | 6.00 | 1.00 | 6.03 | 4.48 | 4.09 | 6.81 | 3.84 | 5.50 | 6.63 |
| Fair D | 48.17 | 42.17 | 44.67 | 2.67 | 3.53 | 5.22 | 5.17 | 4.83 | 5.11 | 5.24 |
| Fair E | 48.17 | 42.17 | 44.67 | 31.33 | 35.33 | 3.13 | 3.11 | 3.47 | 3.17 | 3.43 |
| Fair F | 34.33 | 34.17 | 34.50 | 32.67 | 31.67 | 10.67 | 4.96 | 4.56 | 3.90 | 5.01 |
| Fair G | 53.83 | 47.83 | 50.33 | 33.00 | 25.00 | 38.33 | 2.67 | 5.43 | 5.22 | 1.46 |
| Fair H | 31.50 | 15.50 | 14.00 | 32.67 | 32.67 | 38.00 | 38.33 | 0.00 | 4.33 | 5.44 |
| Fair I | 47.83 | 41.83 | 44.33 | 27.00 | 26.00 | 14.33 | 32.67 | 32.33 | 2.67 | 5.35 |
| Fair J | 55.50 | 49.50 | 52.00 | 34.67 | 26.67 | 40.00 | 4.33 | 40.00 | 34.33 | 6.00 |
*Full-length concatenated genomes (13,133 nt positions) were used for comparisons. Mean numbers of base differences between isolates within each fair are shown on the highlighted diagonal; mean numbers of nucleotide differences between groups of isolates recovered from each fair are shown in the area below the diagonal. SE estimates, which were obtained by a bootstrap procedure using 1,000 replicates, for the between-group mean number of nucleotide differences are shown above the diagonal. Evolutionary analyses were conducted by using MEGA5.2.2 (http://www.megasoftware.net). Gray shading of mean numbers of nucleotide differences indicates higher percentage identity with darker shaded cells. Influenza A virus isolate names have been shortened to conserve space (OSU, indicates swine isolates; human isolates are identified by their unique number). Fair A, OSU50, OSU52; Fair B, OSU129, OSU138; Fair C, OSU175, OSU176; Fair D, OSU268, OSU293, 17; Fair E, OSU307, OSU420; 57; Fair F, OSU363, OSU370; 38; Fair G, OSU447, OSU450, 56; Fair H, OSU464, OSU467, 62; Fair I, OSU483, OSU484, 71; Fair J, OSU522, OSU527, 80.