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Minimum Effective Dose of Cattle and Sheep BSE for Oral Sheep Infection

Author

Listed:
  • Gillian McGovern
  • Stuart Martin
  • Martin Jeffrey
  • Glenda Dexter
  • Steve A C Hawkins
  • Sue J Bellworthy
  • Lisa Thurston
  • Lynne Algar
  • Lorenzo González

Abstract

The minimum dose required to cause infection of Romney and Suffolk sheep of the ARQ/ARQ or ARQ/ARR prion protein gene genotypes following oral inoculation with Romney or Suffolk a sheep Bovine spongiform encephalopathy (BSE)-derived or cattle BSE-derived agent was investigated using doses ranging from 0.0005g to 5g. ARQ/ARQ sheep which were methionine (M) / threonine (T) heterozygous or T/T homozygous at codon 112 of the Prnp gene, dosed ARQ/ARR sheep and undosed controls did not show any evidence of infection. Within groups of susceptible sheep, the minimum effective oral dose of BSE was found to be 0.05g, with higher attack rates following inoculation with the 5g dose. Surprisingly, this study found no effect of dose on survival time suggesting a possible lack of homogeneity within the inoculum. All clinical BSE cases showed PrPd accumulation in brain; however, following cattle BSE inoculation, LRS involvement within Romney recipients was found to be significantly lower than within the Suffolk sheep inoculated group which is in agreement with previous reports.

Suggested Citation

  • Gillian McGovern & Stuart Martin & Martin Jeffrey & Glenda Dexter & Steve A C Hawkins & Sue J Bellworthy & Lisa Thurston & Lynne Algar & Lorenzo González, 2016. "Minimum Effective Dose of Cattle and Sheep BSE for Oral Sheep Infection," PLOS ONE, Public Library of Science, vol. 11(3), pages 1-11, March.
    • Handle: RePEc:plo:pone00:0151440
    DOI: 10.1371/journal.pone.0151440
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    References listed on IDEAS

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    1. M. E. Bruce & R. G. Will & J. W. Ironside & I. McConnell & D. Drummond & A. Suttie & L. McCardle & A. Chree & J. Hope & C. Birkett & S. Cousens & H. Fraser & C. J. Bostock, 1997. "Transmissions to mice indicate that ‘new variant’ CJD is caused by the BSE agent," Nature, Nature, vol. 389(6650), pages 498-501, October.
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