1. Brachyspira hyodysenteriae
5th European Symposium on Porcine Health Management, Edinburgh, UK, May 2013
A farrow-to-finish herd free from swine dysentery years after eradication
Marie Sjölund1, Marie Sterning2, Märit Pringle1, Claes Fellström2
1National Veterinary Institute, SVA; 2Swedish University of Agricultural Sciences, SLU; Uppsala, Sweden
Objective
The aim was to evaluate an eradication program for swine dysentery perfomed 13 years previously in a farrow-to-finish herd
Introduction of swine dysentery by purchase of growers
Brachyspira hyodysenteriae demonstrated in 13/20 (57%) samples
Hemorrhagic diarrhea in fatteners & gilts.
Lawsonia intracellularis demonstrated
Increased prevalence of hemorrhagic diarrhea in fatteners
Brachyspira group III demonstrated in 7/20 samples.
Brachyspira hyodysenteriae
NOT demonstrated
Eradication program
June-October 1999
2013
1995
1997
2011
1999
2001
2003
2005
2007
2009
Regular samplings for Brachyspira spp.
Conversion from specialized fattening production to a farrow-to-finish herd
Total # samples
Brachyspira hyodysenteriae
Brachyspira pilosicoli
Other Brachyspira spp.
210 5 97
Hemorrhagic diarrhea in sows & growers
Eradication program
Sale of surplus growers (treated with 80 ppm tiamulin for 6 days)
Sows treated with an injection of tiamulin (10 mg/kg) followed by
water medication with 120 ppm tiamulin for 11 days
Cleaning & disinfection
- Removal of slats, manure pits emptied
- Manure removed from yard surfaces
- Pressure-wash, drying & disinfection with glutaraldehyde
Sows moved to cleaned and disinfected units
- Sows cleaned & disinfected
- 2nd tiamulin injection (10 mg/kg) on allocation
- Water medication continued for 3 days after allocation
Enforced rodent control
Dogs & cats water medicated with tiamulin
Conclusions
The eradication program for swine dysentery proved to be successful but complete eradication of other Brachyspira spp. was not achieved.
Neither was Lawsonia intracellularis eradicated although tiamulin is effective for treating proliferative enteropathy.
Marie Sjölund DVM PhD
Department of Animal Health and Antimicrobial Strategies
Associate National Veterinary Officer
NATIONAL VETERINARY INSTITUTE
post. SE Uppsala, Sweden
phone fax
. web.