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Excuses, Excuses, Excuses

Mike

Well-known member
USDA EXPLANATION OF THE TEXAS COW TEST RESULTS BEING WRONG:

The IHC Test Variables:
• IHC has been the primary confirmatory test for
USDA’s BSE surveillance program and is recognized
by the World Organization for Animal Health, or OIE.
• IHC allows scientists to determine if a sample is
positive for BSE in two distinct ways:
1.) A staining technique (presence of abnormal
prion protein) that uses antibodies to detect
abnormal prion protein in the brain.
2.) A visual examination to determine whether there
are lesions (holes or “spongy” appearances)
present in the brain.
• Several variables could yield conflicting results:
o IHC is not a standardized, commercially
available test. It involves variables, including
several options in types of antibodies and other
reactive agents. The sensitivity of any given test
is influenced by those variables.


o If the level of infectivity in the animal is extremely
low, the abnormal prion in the brain will be
minimal and therefore more difficult to detect.
o Variations in the conditions under which the
staining process is performed, such as
chemicals and reactive agents used,
temperature and length of antibody exposure,
can also cause the test to yield different results.

Testing History on This Animal:
• In November 2004, a sample from this animal
returned inconclusive for BSE on a Biorad screening
test.
• The sample was subjected to an IHC confirmatory
test, which returned negative.
USDA scientists also ran an additional, experimental
IHC “rapid” tissue fixation test for academic purposes,
which can be conducted more quickly than the IHC
confirmatory test and is therefore of interest to the
scientific community, but it has not been approved
internationally.

While some abnormalities were noted in the
experimental IHC test results, because the test was
not a validated procedure, and because the two
approved IHC tests came back negative, the results
were not considered to be of regulatory significance
and therefore were not reported beyond the
laboratory.


• A Western blot test conducted the week of
June 5, 2005, returned positive for BSE.
• An additional IHC confirmatory test conducted the
week of June 13, 2005, by USDA scientists utilizing
different antibodies from the November 2004 test,
confirmed this case as weakly positive for BSE.
• The Veterinary Laboratories Agency in Weybridge,
England, conducted a series of diagnostic tests
including an IHC, using different antibodies from
those used by USDA in November 2004, which
returned positive results for BSE.
• Experts from the Weybridge lab confirmed the
accuracy of the results of USDA’s November
confirmatory IHC test, concurring that the case could
not have been confirmed on the basis of this sample.
• Weybridge experts also examined the November
experimental IHC test and interpreted the results to
be positive.
Potential Causes of Conflicting Results:
• USDA scientists are consulting with Weybridge
scientists to determine the cause of the conflicting
IHC test results.
• Several factors could cause or contribute to the
discrepancy as follows:
o This animal had a very low level of infectivity and
therefore the sensitivity of USDA’s routine IHC
test might not have been sufficient to detect the
disease.


o Weybridge experts indicate that deposits of
abnormal prion in the brain tissue were not
uniformly distributed and were present at low
concentration, which means that even adjacent
samples of brain tissue might not give identical
results.
 

Econ101

Well-known member
So in other words, the USDA can not detect bse unless it is coming out of a cow's ears, eyes, and mouth due to the infectivity leaking from the brain.
 
A

Anonymous

Guest
Hypocrisy at it's finest.

On one hand, the USDA blamers blame USDA for difficulties in obtaining accurate test results on cattle over 30 months of age. On the other hand, they support Creekstone's use of the same test on cattle under 24 months of age where prions are not even detectable.

Kinda like "don't consumers have a right to know where their beef comes from" followed by "don't burden me with traceback".

Absolutely incredible!

John Kerry has nothing on these guys.

Does anyone need further proof of why R-CULT has no credibility in Washington, D.C.?


~SH~
 

Mike

Well-known member
On one hand, the USDA blamers blame USDA for difficulties in obtaining accurate test results on cattle over 30 months of age. On the other hand, they support Creekstone's use of the same test on cattle under 24 months of age where prions are not even detectable.

It wasn't the "Rapid test" test that was questioned.

It was CORRECT all along!!!

It was the dumb ass confirmatory and the unconventional methods used.

Learn to read.
 
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