Skip to main content

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