TABLE 2.

PFGE comparisons between supershedder E. coli O157:H7 isolates and those from other cattle within their pen (intrapen) or from other pens (interpen)a

PenIntrapenInterpenP value
Total no. of comparisons made% SimilarTotal no. of comparisons made% Similar
3136943370.04
7147142210.002
81883380<0.0001
  • a Isolates from six pens were compared. % Similar denotes the proportion of comparisons in which isolates had ≤1 band difference. P values were derived from chi-square tests.