My main concern is Mexican cattle that are entering the USA. A report
from USDA indicates that 75% of the M. bovis slaughter cases were of
foreign orign during 2003 to 2008. I feel this is a very important
finding and one of major concern since this may represent only a "tip of
the iceberg" as many young tuberculous cattle may not have gross lesions
detected at slaughter and specimens would not have been submitted for
laboratory examination! The number of M.bovis-infected cattle of foreign
orign may be as much as 100 times or more greater than that reported in
NASS Agriculture Statistics. Therfore, more stringent regulations should
be enforced immediately.
I feel strongly that the tuberculin skin tests (CFT and CCT) that are
available and in use in the US are adequate to eliminate
M.bovis-infection in cattle. More than 95% of the TB in cattle in US
has been eliminated by use of the CFT. I strongly feel that additional
hands-on training of accredited veterinarians is needed to emphasize the
importance of good technique and response evaluation. Also, I believe
that a greater emphasis perhaps needs to be placed on interpretation of
results especially in cattle herds in which M. bovis has been identified
in a traceback from slaughter.
While some research work could be conducted to evaluate "new" tests, I
am not optimistic about identifying reliable new tests with improved
sensitivity for field use in the near future. Moreover, I am of the
opinion that serologic assays may be of only limited value.
I do not support any major changes in the regulations regarding the
handling or quarantine of herds in which M. bovis has been diagnosed.
What is being done is necessary in order to eliminate spread of M.bovis!
I think what your organization is doing is appropriate.
I hope you find my comments helpful.
Best regards.
Charles
Comment from Dr. Charles Thoen
This is comment on Notice
Notice of Availability of a Bovine Tuberculosis Program Concept Paper
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