Table 2. Comparison of sequence type (ST), plasmid gene profile (PT) and antimicrobial susceptibility profiles of 96 B. hyodysenteriae isolates recovered in 2014/16 belonging to 30 STs present in 30 herds in different Australian States that either were thought to be free of swine dysentery (SD), to have the disease, or to be of uncertain health status.
| Herds thought to be free of SD (13 herds, 12 STs, 39 isolates) | Sequence type (ST), plasmid gene type (PT) and antimicrobial susceptibility profilesa | ||||||
|---|---|---|---|---|---|---|---|
| Australian Stateb | Herd code | No of isolates with same profilec | STd | PT | Lincomycin MIC | Tylosin MIC | Tiamulin MIC |
| NSW | Herd 5 | 2 | 160 | 1 | R (≥36>72) | R (≥100) | I (<0.5) |
| NSW | Herd 5 | 5 | 150 | 7 | R (≥36>72) | R (≥100) | S (<0.25) |
| SA | Herd 20 | 2 | 147 | 1 | R (≥72) | R (≥100) | I (≥1<2) |
| SA | Herd 20 | 1 | 148 | 1 | R (≥72) | R (≥5<25) | I (<0.5) |
| SA | Herd 27 | 3 | 49 | 1 | R (≥72) | R (≥100) | I (≥1<2) |
| SA | Herd 28 | 1 | 151 | 1 | R (≥72) | R (≥100) | I (<0.5) |
| VIC | Herd 50 | 2 | 150 | 7 | S (<2) | I (≥1<5) | I (<0.5) |
| NSW | Herd 62 | 2 | 150 | 7 | R (≥72) | R (≥100) | I (<0.5) |
| VIC | Herd 63 | 1 | 50 | 1 | R (≥36<72) | R (≥100) | I (<0.5) |
| VIC | Herd 63 | 1 | 50 | 1 | I (≥16<36) | R (≥100) | I (≥0.5<1) |
| VIC | Herd 63 | 2 | 153 | 7 | I (≥4<16) | R (≥5<25) | I (<0.5) |
| VIC | Herd 68 | 2 | 150 | 7 | R (≥36>72) | R (≥5<25) | I (<0.5) |
| VIC | Herd 70 | 1 | 150 | 7 | S (<2) | I (≥1<5) | I (<0.5) |
| VIC | Herd 80 | 1 | 159 | 1 | R (≥72) | R (≥100) | R (≥4<8) |
| WA | Herd 86 | 3 | 50 | 1 | S (<2) | R (≥25<50) | I (≥0.5<1) |
| WA | Herd 86 | 1 | 161 | 1 | S (<2) | R (≥5<25) | I (<0.5) |
| WA | Herd 86 | 1 | 50 | 1 | S (<2) | I (≥1<5) | S (<0.25) |
| WA | Herd 86 | 1 | 50 | 1 | R (≥72) | R (≥100) | S (<0.25) |
| WA | Herd 86 | 1 | 50 | 1 | R (≥72) | I (≥1<5) | S (<0.25) |
| WA | Herd 87 | 4 | 140 | 4 | S (<2) | R (≥100) | I (<0.5) |
| WA | Herd 88 | 2 | 144 | 1 | R (≥72) | R (≥100) | S (<0.25) |
| Herds reported to have SD (11 herds, 17 STs, 35 isolates) | |||||||
| NSW | Herd 2 | 1 | 157 | 1 | I (≥16<36) | R (≥100) | I (<0.5) |
| NSW | Herd 2 | 2 | 162 | 1 | S (<2) | R (≥5<25) | S (<0.25) |
| NSW | Herd 2 | 1 | 140 | 4 | R (≥72) | R (≥100) | I (<0.5) |
| NSW | Herd 2 | 3 | 143 | 4 | R (≥72) | R (≥100) | I (<0.5) |
| NSW | Herd 3 | 1 | 145 | 1 | S (<2) | R (≥5<25) | I (<0.5) |
| NSW | Herd 3 | 1 | 145 | 1 | I (≥4<16) | R (≥50<100) | S (<0.25) |
| NSW | Herd 3 | 1 | 146 | 1 | NTe | NT | NT |
| NSW | Herd 3 | 1 | 154 | 1 | I (≥4<16) | R (≥50<100) | S (<0.25) |
| SA | Herd 21 | 2 | 49 | 1 | R (≥72) | R (≥5<25) | I (<0.5) |
| SA | Herd 37 | 1 | 152 | 1 | R (≥72) | R (≥100) | I (<0.5) |
| VIC | Herd 46 | 2 | 150 | 7 | R (≥72) | R (≥100) | R (≥8) |
| VIC | Herd 49 | 1 | 158 | 2 | R (≥36>72) | R (≥100) | R (≥4<8) |
| VIC | Herd 71 | 4 | 166 | 3 | R (≥72) | R (≥100) | R (≥8) |
| VIC | Herd 71 | 1 | 166 | 4 | R (≥72) | R (≥100) | R (≥8) |
| VIC | Herd 73 | 1 | 155 | 1 | I (≥4<16) | R (≥100) | I (<0.5) |
| VIC | Herd 73 | 1 | 156 | 1 | I (≥16<36) | R (≥100) | I (<0.5) |
| VIC | Herd 73 | 8 | 144 | 1 | R (≥72) | R (≥100) | S (<0.25) |
| VIC | Herd 75 | 1 | 149 | 1 | R (≥72) | R (≥100) | I (<0.5) |
| VIC | Herd 78 | 1 | 163 | 4 | I (≥4<16) | R (≥5<25) | S (<0.25) |
| VIC | Herd 85 | 1 | 143 | 4 | R (≥72) | R (≥100) | S (<0.25) |
| Herds of uncertain disease status (6 herds, 8 STs, 22 isolates) | |||||||
| QLD | Herd 8 | 4 | 165 | 1 | R (≥72) | R (≥100) | I (<0.5) |
| SA | Herd 12 | 1 | 164 | 3 | R (≥72) | R (≥100) | I (<0.5) |
| QLD | Herd 13 | 1 | 141 | 1 | NT | NT | NT |
| QLD | Herd 13 | 1 | 142 | 1 | NT | NT | NT |
| VIC | Herd 47 | 5 | 150 | 7 | R (≥72) | R (≥5<25) | R (≥8) |
| WA | Herd 95 | 7 | 31 | 5 | S (<2) | R (≥100) | S (<0.25) |
| WA | Herd 98 | 1 | 144 | 1 | I (≥4<16) | R (≥100) | I (<0.5) |
| WA | Herd 98 | 2 | 140 | 4 | R (≥72) | R (≥100) | I (<0.5) |
aST, sequence type in MLST; PT, plasmid gene profile type (see Materials and Methods for definition); S, sensitive; I, intermediate; R, resistant.
bQLD, Queensland; NSW, New South Wales; SA, South Australia; VIC, Victoria; WA, Western Australia
cTwo isolates respectively from herd 28 (ST151) and herd 86 (ST161) were weakly hemolytic
dSTs 140, 144 and 150 were recovered from pigs from all three categories of health status, and STs 49 and 143 were found in two categories. The other STs were only found in one health status category.
eNT, Not tested.