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Infection dynamics of Mycoplasma hyorhinis in three commercial pig populations
  1. M. J Clavijo, DVM, PhD1,
  2. D. Murray, DVM2,
  3. S. Oliveira, DVM, MS, PhD3 and
  4. A. Rovira, DVM, MS, PhD3
  1. 1 Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, 1800 Christensen Drive, Ames, IA 50011-1134, USA
  2. 2 New Fashion Pork, 164 Industrial Parkway, Jackson, MN 56143, USA
  3. 3 Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, 1333 Gortner Ave, 230 VDL, Saint Paul, MN 55108, USA
  1. E-mail for correspondence: mclavijo{at}


Mycoplasma hyorhinis is one of the causative agents of polyserositis and arthritis in postweaning pigs. Knowledge regarding colonisation frequency and age distribution in modern pig production is lacking. The objective of this study was to estimate the prevalence of M hyorhinis colonisation in different age groups across three commercial pig populations. Nasal swabs were collected from sows, piglets and nursery pigs of different ages. Oral fluids were collected from nursery pigs. Necropsies were performed to assess the presence of M hyorhinis-associated disease. M hyorhinis was detected in 5/60 sows in herd A, 3/60 in herd B and none in herd C. In herd A and B, the prevalence was low in preweaning piglets (∼8 per cent) and high in postweaning pigs (∼98 per cent). A total of 7/8 oral fluids tested PCR positive in herds A and B, while 1/8 tested positive in herd C. In herd C, the preweaning and postweaning prevalence was low. In herds A and B, necropsied pigs had polyserositis lesions where M hyorhinis was detected by PCR. This study showed that prevalence of M hyorhinis colonisation varies with pig age and across farms. Information generated will aid in the design and implementation of control and prevention strategies.

  • Polyserositis
  • Swine
  • Epidemiology
  • Arthritis
  • Mycoplasma hyorhinis
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