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American Chemical Society's Weekly PressPac -- June 18, 2008


Prions are not degraded by conventional sewage treatment processes
Environmental Science & Technology

Scientists in Wisconsin are reporting in a paper scheduled for the July 1 issue of ACS' Environmental Science & Technology that typical wastewater treatment processes do not degrade prions. Prions, rogue proteins that cause incurable brain infections such as Mad Cow disease and its human equivalent, variant Creutzfeldt-Jakob Disease, are difficult to inactivate, resisting extreme heat, chemical disinfectants, and irradiation. Until now, scientists did not know whether prions entering sewers and septic tanks from slaughterhouses, meatpacking facilities, or private game dressing, could survive and pass through conventional sewage treatment plants.

Joel Pedersen and colleagues used laboratory experiments with simulated wastewater treatment to show that prions can be recovered from wastewater sludge after 20 days, remaining in the "biosolids," a byproduct of sewage treatment sometimes used to fertilize farm fields.

Although emphasizing that prions have never been reported in wastewater treatment plant water or biosolids, the researchers note that existing tests are not sufficiently sensitive to detect the extremely low levels of prions possible in those materials. AD

ARTICLE #1 FOR IMMEDIATE RELEASE "Persistence of Pathogenic Prion Protein during Simulated Wastewater Treatment Processes"


Joel A. Pedersen, Ph.D.
University of Wisconsin
Madison, Wisconsin
Phone: (608) 263-4971
Fax: (608) 265-2595


New test for more reliable product expira

Contact: Michael Woods
American Chemical Society

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