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Table 3 Different level of the production chain of the two layer farms

From: Recovery of Salmonella isolated from eggs and the commercial layer farms

Level

Origins

Na

Salmonella serotypes

Prevalenceb

S. Derby

S. Braenderup

S. Enteritidis

S. Jerusalem

S. Bovismorbificans

Un-identified

Old layer farm

 Farm

Cage

6

5

     

33.3% (18/54)

Egg (from cage)

42

3

  

3

 

1

Egg nest

6

6

     

New layer farm

 Farm

Cage

6

6

     

51.1% (23/45)

Egg belt

6

6

     

Egg (from belt)

18

1

3

 

1

1

1

Egg collection conveyer

3

1

  

1

  

Egg (from conveyer)

12

   

1

1

1

 Processing

Washing room

12

1

  

1

  

27.3% (6/22)

Irradiation room (UV)

1

   

1

  

Package room

9

3

     

 Storage

Storage room

12

   

3

 

1

33.3% (4/12)

 Retail

Retail eggs

12

1

1

 

1

 

3

50.0% (6/12)

  1. aSample number
  2. bThe prevalence of Salmonella was among the samples in different level of the production chain