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Table 3 Number of ESBL/ AmpC Escherichia coli (EEC) challenge organisms (mean log10 cfu/g of 4 birds) in caecal contents of broiler chickens pre-treated with a competitive exclusion (CE) culture on day 1 of life or untreated controls exposed to seeder birds infected with EEC 1475 N (CTX-M-15) or EEC 1476 N (TEM 20) at 2 days of life (5 contact birds/ 1 seeder bird) (experiment 3)

From: Efficacy of a competitive exclusion culture against extended-spectrum β-lactamase-producing Escherichia coli strains in broilers using a seeder bird model

Day of life Group 1 Group 2 Group 3 Group 4
1 20 contact birds pre-treated with a CE culture 20 contact birds untreated 20 contact birds pre-treated with a CE culture 20 contact birds untreated
2 Addition of 4 seeder birds infected with EEC 1475 N (105 cfu/ bird) Addition of 4 seeder birds infected with EEC 1475 N (105 cfu/ bird) Addition of 4 seeder birds infected with EEC 1476 N (105 cfu/ bird) Addition of 4 seeder birds infected with EEC 1476 N (105 cfu/ bird)
  Caecal contents Caecal contents Caecal contents Caecal contents
9 2.8a 7.2 5.6b 8.6
16 5.3a 7.9 6.6b 9.1
23 6.1 7.3 6.8b 8.5
30 5.9a 7.6 6.1b 7.8
37 3.7a 6.1 5.7b 7.8
  1. asignificantly lower than group 2; bsignificantly lower than group 4
  2. Standard error: 0.405
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