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Table 4 Average group similarity of PFGE profiles by source of isolates compared by bootstrapping analyses (n = 1000) to the similarity of PFGE profiles for all isolates within a pen or across all pens

From: Genetic diversity and antimicrobial resistance among isolates of Escherichia coliO157: H7 from feces and hides of super-shedders and low-shedding pen-mates in two commercial beef feedlots

Feedlot Pen SS fecal PFGE similarity (%) Signifyof group PS PFGE similarity (%) Signif of group LS fecal PFGE similarity (%) Signif of group
Within pen       
A 1 57.92 NS 59.94 NS 89.82 ***
  2 62.18 NS 60.75 NS 72.80 ***
  3 78.23 *** 58.62 *** 67.04 ***
  4 85.92 *** 68.59 *** 72.70 ***
  5 68.61 ** 87.03 *** 70.97 ***
  6 60.08 NS 73.49 ** 85.72 *
  7 INz IN IN IN IN IN
B 1 69.72 *** 64.81 *** 66.19 ***
  2 73.98 *** 72.13 *** 86.69 ***
  3 77.66 *** 68.89 *** 88.99 ***
  4 IN IN IN IN IN IN
Across all pens   64.80 *** 61.21 NS 64.91 ***
  1. SS fecal = fecal sample from super shedder (at least 104 CFU/g feces); LS = fecal sample from low shedder (< 104 CFU/g feces), PS = Perineal hide swab.
  2. ySignif, significance comparing group PFGE similarity with that of all isolates in a pen or across all pens, with *** = P < 0.001, ** = P < 0.01, * = P < 0.05, NS = P > 0.05.
  3. zIN, insufficient number of isolates for comparison, a minimum of 2 PFGE profiles per group are required.