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Table 2 Numbers of super-shedder (SS) v and low-shedder (LS) w isolates from both samplings sharing restriction endonuclease digestion pattern clusters (REPC, 90% or greater similarity) and description of most prevalent REPC, REPC A by feedlot and pen

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

  All REPCx REPC A only
Feedlot Pen No.SS No.LS No. SS sharing REPC with LS (%) No. SS in SS only REPC (%) No. isolates No, SS fecal No. SS hide No. LS fecal
A 1* 3 16 1 (33) 2 (67) 15 1 1 13
  2* 36 47 12 (33) 24(67) 41 12 6 23y
  3 12 100 11(92) 1(8) 5 4 1 0
  4 19 56 0 (0) 19 (100) 11 9 2 0
  5 7 27 0(0) 7 (100) 4 4 0 0
  6 3 2 0(0) 3(100) 1 1 0 0
  7 0 1 NAz NA 2 0 0 2
B 1 27 76 4(15) 23 (85) 12 12y 0 0
  2* 44 116 9 (20) 35 (80) 120 9 10 101y
  3* 10 23 1(10) 9 (90) 19 1 0 18
  4 1 31 0 (0) 1(100) 5 0 0 5
Total   162 496 38 (23) 124 (77) 235 53 20 162
  1. Pens where SS and LS isolates belonged to REPC A are marked by *, percentages are bracketed.
  2. vSuper-shedder, shedding at least 104 CFU E. coli O157:H7/g feces.
  3. wLow-shedder, shedding < 104 CFU E. coli O157:H7/g feces.
  4. xAll REPC, number of super-shedders based on fecal isolates, super-shedder fecal and hide swab isolates included in REPC shared with low-shedders.
  5. yIncludes isolates from the second sampling.
  6. zNA, not applicable, no super-shedders in pen.