PMID: 16520535Mar 8, 2006Paper

Evaluation of bovine spongiform encephalopathy (BSE) infection risk of cattle via sewage sludge from wastewater treatment facilities in slaughterhouses in Japan

The Journal of Veterinary Medical Science
Takehisa YamamotoToshiyuki Tsutsui

Abstract

Scattered SRM residues from BSE-infected cattle are possible to contaminate sewage during the slaughtering process in slaughterhouses. A proportion of the sludge discharged from wastewater treatment facilities at slaughterhouses has historically been processed into fertilizer. We therefore investigated the associated risk of BSE infection to cattle via sludge-derived fertilizer. Each stage of the process associated with BSE exposure was qualitatively evaluated and quantitative evaluations were subsequently performed using infectious dose as a unit of concern. Results of these qualitative evaluations indicated that installation of filter(s) at the drains to the wastewater treatment facilities has been undertaken by many slaughterhouses and has decreased the likelihood of SRM contamination of sewage. The level of sludge-derived fertilizer ingested by cattle was considered to be very low since the fertilizer is mixed with the ground soil, and the amount of soil ingested by cattle is likely to be small. Results from the quantitative analysis indicated the total infectious dose ingested by cattle in Japan from an infected cow has been estimated to be 5.5 x 10(-3) ID(50). Preventing scattering of SRM during the slaughtering process, ...Continue Reading

References

Nov 13, 1998·Proceedings of the National Academy of Sciences of the United States of America·S B Prusiner
Sep 15, 2001·Journal of Applied Microbiology·P Gale, G Stanfield

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Citations

Aug 30, 2008·Environmental Science & Technology·Glen T HinckleyJoel A Pedersen
Jan 17, 2009·Journal of Applied Microbiology·C Maluquer de MotesR Girones
Nov 7, 2012·Risk Analysis : an Official Publication of the Society for Risk Analysis·Amie AdkinLouise Kelly
Feb 27, 2009·Prion·Samuel E SaundersJason C Bartz

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