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Table 2 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 1478 N (SHV-12) or EEC 1479 N (CMY-2) at 2 days of life (5 contact birds/ 1 seeder bird) (experiment 2)

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 1478 N (105 cfu/ bird) Addition of 4 seeder birds infected with EEC 1478 N (105 cfu/ bird) Addition of 4 seeder birds infected with EEC 1479 N (105 cfu/ bird) Addition of 4 seeder birds infected with EEC 1479 N (105 cfu/ bird)
  Caecal contents Caecal contents Caecal contents Caecal contents
9 2.3a 6.6 3.2b 6.1
16 4.4a 6.3 4.9b 6.5
23 3.5a 6.5 3.0b 6.6
30 2.8a 5.5 2.8b 6.4
37 2.4a 5.9 3.3b 5.9
  1. asignificantly lower than group 2; bsignificantly lower than group 4
  2. Standard error: 0.487