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Eradication of endemic Brachyspira pilosicoli infection from a farrowing herd: a case report

Published online by Cambridge University Press:  28 February 2007

M. Fossi ,
M. Heinonen ,
T. Pohjanvirta ,
S. Pelkonen  and
O.A.T. Peltoniemi
M. Fossi*
Affiliation:
National Veterinary and Food Research Institute, Regional Laboratory in Seinäjoki, Saarentaus, Finland
M. Heinonen
Affiliation:
University of Helsinki, Faculty of Veterinary Medicine, Department of Clinical Veterinary Sciences, Saarentaus, Finland
T. Pohjanvirta
Affiliation:
National Veterinary and Food Research Institute, Regional Laboratory in Kuopio, Saarentaus, Finland
S. Pelkonen
Affiliation:
National Veterinary and Food Research Institute, Regional Laboratory in Kuopio, Saarentaus, Finland
O.A.T. Peltoniemi
Affiliation:
University of Helsinki, Faculty of Veterinary Medicine, Department of Clinical Veterinary Sciences, Saarentaus, Finland
*
*National Veterinary and Food Research Institute, Regional Laboratory in Seinäjoki, Box 198, 60101 Seinäjoki, Finland. E-mail: [email protected]
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Abstract

Brachyspira pilosicoli and B. innocens were isolated repeatedly from a herd of 60 sows which mostly produced feeder pigs but also raised some fattening pigs. Postweaning diarrhea had been a severe problem in this herd for years. The B. pilosicoli eradication plan was based on the general guidelines for elimination of B. hyodysenteriae, with some modifica-tions. The eradication measures were run in August 1997. In-feed medication with 200p.p.m. tiamulin lasted for 18–30 days, depending on the age group. The piggery unit was emptied, cleaned, disinfected and dried, and all worn surfaces were repaired. The animals were removed to temporary sheds situated 0–100m from the piggery unit. Only the sows and the boar returned to the piggery unit. All other pigs were sold from the sheds within 3 months after the eradication. Immediately after the eradication, the clinical postweaning diarrhea disappeared. The success of the program was monitored four times bacteriologically, and the last control sampling was in December 1999, 7 months after the total withdrawal of antimicrobial feed additives. The primary cultures from the last three samplings were also analysed with B. pilosicoli-specific PCR. All the samples were negative for B. pilosicoli. However, B. innocens could be isolated from each batch of samples. The analysis of B. inno-cens isolates by pulsed-field gel electrophoresis indicated that at least one genotype persisted in the herd. The clinical and laboratory findings suggest that the eradication of B. pilosicoli had succeeded in this herd

Type
Research Article
Information
Animal Health Research Reviews , Volume 2 , Issue 1 , June 2001 , pp. 53 - 58
Copyright
Copyright © CAB International 2001

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