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Table 3 Bacteriological results by sampling date and year and sample type per animal category and per location. C1, C2, C3, C4: corridors in barns A – D respectively, AI: artificial insemination centre (see Fig. 1). Sample types: S/D/P: combined sock sample, dust wipe and pooled faecal sample from the same compartment, S/D: sock sample and dust wipe from the same compartment or corridor, S: sock sample, . or -: not done. Bacteriological results for combined samples per compartment or corridor are presented as xxx/xxx/xxx or xxx/xxx, results of separate compartments are separated by, (comma). *: significant decrease since previous high number of positive samples (Fisher exact test, P < 0.05), #: significant increase since previous low number of positive samples (Fisher exact test, P < 0.05), field = S. Typhimurium field strain, ST = undifferentiated S. Typhimurium., group C = Salmonella enterica serogroup C isolate, vac = Salmoporc® vaccine strain, neg = negative

From: Salmonella Typhimurium environmental reduction in a farrow-to-finish pig herd using a live attenuated Salmonella Typhimurium vaccine

  

C1

C2

C3

C4

Farrowing

AI and gestation

Weaned piglets barn B

Weaned piglets barn D

Grow finishers barn C

Grow finishers barn D

Positive and Total Salm samples

Remarks

Aug-16

location

.

1 S/D

1 S/D

.

1 S/D/P

1 S/D/P

1 S/D/P

.

1 S/D/P, 2 S/D

.

  
 

Salm result

.

neg/neg

field/field

.

neg/field/neg

neg/neg/neg

neg/neg/neg

.

neg/neg/neg, 2 field/field

.

7 / 20

1 G/F in barn C treated with colistin was ST-field positive

Sep-16

location

.

1 S/D

1 S/D

.

1 S/D/P

1 S/D/P

1 S/D/P

.

1 S/D/P, 2 S/D

.

  
 

Salm result

 

neg/neg

field/field

 

vac/vac/field

field/vac/neg

vac/neg/neg

 

field/field/field, field/neg, field/group C

 

10 / 20

Weaned piglets were being treated with amoxycillin

Okt-16

location

1 S/D

1 S/D

1 S/D

1 S/D

1 S/D/P

1 S/−/P

1 S/D/P

.

1 S/D/P

.

  
 

Salm result

ST/ST

neg/neg

ST/ST

ST/neg

ST/ST/neg

ST/./neg

ST/ST/neg

.

ST/neg/ST

.

12 / 19

Isolates were not differentiated between field and vaccine strain

Nov-16

location

.

1 S/D

1 S/D

.

1 S/D

1 S/D

1 S/D

.

5 S/D

.

 

Stopped pooled faecal samples

 

Salm result

.

neg/neg

neg/neg

.

vac/vac

neg/vac

vac/neg

.

3 neg/neg, 2 field/field

.

4 / 20*

 

Dec-16

location

1 S/D

1 S/D

1 S/D

.

1 S/D

1 S/D

1 S/D

.

3 S/D

.

  
 

Salm result

vac/neg

vac/neg

field/field

.

neg/neg

vac/vac

vac/vac

.

2 vac/neg, field/field

.

4 / 18

 

Total 2016

          

37 / 97 (38%)

 

Jan-17

location

.

1 S/D

1 S/D

.

1 S/D

1 S/D

1 S/D

.

5 S/D

.

  
 

Salm result

.

neg/neg

field/field

.

field/neg

field/field

vac/vac

.

neg/neg, field/neg, 2 field/field, neg/field

.

11 / 20#

1 G/F non-vaccinated was field/field-pos. 1 G/F with old F had diarrhoea: field/field

Feb-17

location

1 S/D

1 S/D

1 S/D

.

1 S/D

1 S/D

1 S/D

.

4 S/D

.

  
 

Salm result

neg/vac

vac/neg

neg/neg

.

field/vac

neg/vac

vac/vac

.

2 neg/neg, neg/vac, neg/field

.

2 / 20*

 

Apr-17

location

.

1 S/D

1 S/D

.

1 S/D

1 S/D

2 S/D

.

4 S/D

.

  
 

Salm result

.

vac/neg

neg/field

.

neg/vac

vac/vac

vac/neg, vac/neg

.

2 vac/neg, neg/neg, field/neg

.

2 / 20

1 G/F in barn C had diarrhoea: field/neg

Mei-17

location

.

1 S/D

1 S/D

.

2 S

1 S/D

3 S

3 S

6 S

.

  
 

Salm result

.

neg/neg

neg/field

.

vac, vac

neg/vac

3 vac

2 vac, 1 neg

5 neg, 1 vac

.

1 / 20

Changed sampling scheme: no dust sample in compartments

Jun-17

location

.

1 S

1 S/D

 

1 S

1 S

2 S

2 S

6 S

1 S

  
 

Salm result

.

vac

neg/neg

 

vac

vac

vac, field

2 vac

4 vac, 2 neg

neg

1 / 16

 

Jul-17

location

.

1 S/D

1 S/D

1 S/D

2 S

1 S

3 S

2 S

4 S

2 S

  
 

Salm result

.

neg/neg

neg/neg

neg/neg

vac, vac

vac

3 vac

neg, vac

3 neg, 1 vac

neg, vac

0 / 20

 

Aug-17

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

3 S

2 S

4 S

3 S

  
 

Salm result

.

neg/vac

neg/field

neg/neg

neg

vac

3 vac

neg, vac

3 vac, 1 field

neg, 2 vac

2 / 20

 

Sep-17

location

.

1 S/D

1 S/D

1 S/D

 

1 S

3 S

2 S

5 S

2 S

  
 

Salm result

.

neg/neg

neg/neg

neg/neg

 

neg

3 vac

vac, neg

3 neg, 1 vac, 1 field

2 neg

1 / 19

 

Okt-17

location

.

1 S/D

1 S/D

1 S/D

  

4 S

2 S

5 S

2 S

  
 

Salm result

.

neg/neg

field/neg

neg/neg

  

3 vac, neg

2 vac

2 neg, 2 vac, 1 field

vac, field

3 / 20

1 G/F in barn C had diarrhoea: field

Nov-17

location

.

1 S/D

1 S/D

1 S/D

2 S

1 S

2 S

3 S

5 S

1 S

  
 

Salm result

.

neg/neg

field/neg

field/field

2 neg

field

vac, field

2 field, neg

4 field, neg

field

12 / 20#

3 G/F in barn C had diarrhoea and were treated with colistin, pos for field strain

Dec-17

location

.

1 S/D

1 S/D

1 S/D

2 S

2 S

2 S

2 S

5 S

1 S

  
 

Salm result

.

vac/neg

neg/neg

neg/field

2 vac

2 neg

2 vac

2 vac

vac, 2 neg, 2 field

neg

3 / 20*

 

Total 2017

          

38 / 215 (17.7%)

 

Jan-18

location

.

1 S/D

1 S/D

1 S/D

2 S

1 S

2 S

2 S

5 S

2 S

  
 

Salm result

.

neg/neg

neg/field

neg/field

neg, vac

vac

2 vac

2 vac

3 vac, 2 field

2 field

6 / 20

2 G/F in barn D had diarrhoea and were treated with colistin

Feb-18

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

3 S

2 S

5 S

2 S

  
 

Salm result

.

vac/vac

neg/neg

neg/neg

vac

neg

2 field, 1 vac

vac, field

field, vac, 3 neg

2 field

6 / 20

 

Mrt-18

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

3 S

2 S

5 S

2

  
 

Salm result

.

vac/vac

vac/neg

vac/vac

vac

neg

3 vac

neg, vac

3 neg, 2 vac

neg, field

1 / 20

1 G/F in barn D with some diarrhoea, pos for field strain

Apr-18

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

3 S

2 S

5 S

2 S

  
 

Salm result

.

vac/vac

neg/neg

field/neg

neg

neg

vac, 2 neg

2 neg

4 neg, 1 vac

vac, field

2 / 20

1 G/F in barn D with some diarrhoea, pos for field strain

Jun-18

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

2 S

2 S

5 S

3 S

  
 

Salm result

.

neg/vac

neg/neg

neg/neg

vac

vac

2 neg

2 vac

3 vac, 2 neg

field, vac, neg

1 / 20

1 G/F in barn D with diarrhoea in one pen, pos for field strain

Aug-18

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

2 S

3 S

5 S

2 S

  
 

Salm result

.

vac/vac

neg/neg

field/neg

field

neg

2 vac

3 neg

4 neg, 1 vac

field, vac

3 / 20

1 G/F in barn C had some diarrhoea: neg, 1 G/F in barn D was also pos in jun-18

Okt-18

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

3 S

2 S

5 S

2 S

  
 

Salm result

.

neg/vac

field/field

neg/neg

neg

neg

2 vac, 1 neg

neg, field

4 field, neg

field, neg

8 / 20#

2 G/F in barn C some diarrhoea, both field strain pos

Dec-18

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

3 S

2 S

5 S

2 S

  
 

Salm result

.

neg/neg

neg/neg

field/neg

neg

field

3 neg

2 neg

1 vac, 4 field

neg, field

7 / 20

2 G/F in barn C some diarrhoea, both field strain pos

Total 2018

          

34 / 160 (21.3%)

 

Feb-19

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

3 S

2 S

5 S

2 S

  
 

Salm result

.

neg/neg

field/neg

neg/neg

vac

neg

3 vac

2 vac

4 vac, 1 field

neg, field

3 / 20

1 G/F in barn C was also pos in dec-18

Apr-19

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

3 S

2 S

5 S

2 S

  
 

Salm result

.

vac/neg

neg/neg

neg/neg

field

neg

2 vac, 1 neg

2 neg

2 field, 3 neg

2 neg

3 / 20

 

May-19

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

2 S

2 S

6 S

2 S

  
 

Salm result

.

neg/neg

field/neg

neg/neg

neg

neg

2 vac

2 vac

4 neg, 1 vac, 1 field

2 neg

2 / 20

1 G/F in barn C had some diarrhoea: pos for field strain

Jul-19

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

2 S

3 S

5 S

2 S

  
 

Salm result

.

neg/neg

field/neg

vac/field

neg

vac

2 vac

2 neg, 1 vac

5 neg

2 neg

2 / 20

 

Sep-19

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

4 S

2 S

4 S

2 S

  
 

Salm result

.

neg/neg

neg/neg

neg/neg

neg

neg

4 vac

1 vac, 1 neg

2 neg, 2 vac

2 neg

0 / 20*

1 G/F in barn C has some diarrhoea: neg

Nov-19

location

.

1 S/D

1 S/D

1 S/D

.

2 S

4 S

1 S

5 S

2 S

  
 

Salm result

.

neg/neg

neg/neg

vac/neg

.

vac, neg

4 vac

vac

5 vac

vac, neg

0 / 20

 

Total 2019

          

10 / 120 (8.3%)

 

Oct-20

location

.

1 S/D

1 S/D

1 S/D

1 S

1 S

3 S

2 S

6 S

1 S

  
 

Salm result

.

vac/vac

neg/neg

vac/neg

vac

vac

2 vac, 1 neg

2 neg

2 vac, 4 neg

neg

0 / 20

 

Total

           

119 / 612 (19.4%)