Prevalence of Brachyspira hyodysenteriae in sows and suckling piglets
Joshua W. Duff, BS; Jeremy S. Pittman, DVM, Diplomate ABVP; J. Mark Hammer, DVM, MS; Joann M. Kinyon, MS
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Objective: To estimate the prevalence of Brachyspira hyodysenteriae (B hyo) in breeding animals, lactating sows, and their suckling offspring in swine dysentery- (SD-) positive herds.
Materials and methods: Study 1: lactating sows and suckling piglets. Rectal swabs were collected eight times at 1- to 4-week intervals from an SD-positive breed-to-wean farm. At each sampling, rectal swabs were collected from 60 “sets” of animals (individual swabs from a sow and three suckling piglets). Piglet samples were tested as a litter. Samples were tested by Brachyspira species culture and confirmed by culture-based polymerase chain reaction (PCR). Study 2: breeding herds. Five SD-positive sow farms, varying in size, were selected for evaluation of breeding-herd prevalence of B hyo. Rectal swabs were collected once per farm from 150 randomly selected sows. Samples were tested by Brachyspira species culture and confirmed by culture-based PCR.
Results: Study 1: lactating sows and suckling piglets. The percentage of sows on a farm that were positive for B hyo ranged from 0% to 5%, with an overall prevalence of 1.04%. The percentage of litters culture-positive and PCR-positive for B hyo ranged from 0% to 5%, with an overall prevalence of 1.88%. Study 2: breeding herds. The percentage of sows positive for B hyo ranged from 0% to 1.33%. Only three of the five farms tested positive.
Implications: Sampling breeding herds and suckling-age piglets could serve as a valuable alternative to traditional surveillance schemes. Understanding the prevalence of SD on endemically infected sow farms could enhance current surveillance programs.
Keywords: Brachyspira hyodysenteriae, sows, piglets, prevalence
Cite as: Duff JW, Pittman JS, Hammer JM, et al. Prevalence of Brachyspira hyodysenteriae in sows and suckling piglets. J Swine Health Prod 2014;22(2):71-77.
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