Table I.
Virulence genes
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Serotype | stx1 | stx2 | hlyA | eae | No. of pensa | No. of feedlotsa | Month (no. of isolates, pen typeb) |
O2:H27 | − | + | + | − | 2 | 2 | March (2, SOF)
November (1, PS) |
O113:H21 | − | + | − | − | 2 | 2 | April (1, SOF)
December (1, SOF) |
O165:H25 | − | + | − | + | 1 | 1 | April (1, SOF) |
O?:NM | + | − | + | − | 1 | 1 | April (1, SOF) |
O?:H5 | + | − | − | − | 1 | 1 | March (1, PS) |
O?:H29 | − | + | − | − | 1 | 1 | April (1, SOF) |
O145:NM | − | + | + | + | 1 | 1 | June (1, PS) |
O15:H16 | − | + | − | − | 1 | 1 | September (1, SOF) |
O51:NM | + | − | − | − | 1 | 1 | November (1, SOF) |
O?:H16 | − | + | − | − | 1 | 1 | October (1, PS) |
O139:H19 | + | + | + | − | 1 | 1 | December (1, SOF) |
(O111) | − | + | NA | + | 1 | 1 | March (1, SOF) |
NA — not available: the isolate could not be recovered for serotyping and hlyA testing after storage but had been positive for the stx2 and eaeO111 genes.
Multiple isolates were recovered from 2 pens in 2 different feedlots.
At each feedlot visit, the pen shortest on feed (SOF) and the pen closest to slaughter (within 2 wk preslaughter [PS]) were sampled.