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Teaching Workshop: Bovine Spongiform Encephalopathy (BSE) APHIS BSE Surveillance Program

Targeted surveillance
(These are broad categories of US surveillance. )

  • Non-ambulatory animal
  • Dead stock
  • Field CNS Cases and on-farm suspects
  • Veterinary Diagnostic Laboratory data
  • Public health laboratories
  • CNS condemns at slaughter and other antemortem condemns in certain categories

Surveillance goals

  • Surveillance at a level sufficient to find 1 case per 1 million adult cattle, 95% confidence
  • Based on estimates of targeted high risk population
    • Non-ambulatory - 195,000
    • Broader estimate, including deads and other condemns - 600,000
    • Adult cattle population - 45 million
  • Estimate high risk population
    • FSIS condemns (CNS, emaciation, tetanus, deads, injuries, moribund) - 194,225
    • CNS on farm FAD's - 129
    • Dead on farm of unknown causes (NAHMS, NASS estimates) - 340,000
  • Total - 534,354
  • Rounded total estimate = 600,000
  • FY 02 and FY 03 - goal was 12,500
    • Based on estimate of non-ambulatory animals as targeted population (195,000)
  • FY 04 - goal is at least 40,000
    • Based on broader estimate of targeted population (600,000)
    • Statistical calculation is 38,462 samples necessary, rounded up to 40,000

Surveillance: US Regions
(Surveillance of free ranging cervids.)

  • GRAPHIC - Map of U.S. showing surveillance regions: Northwest, Southwest, North Central, Central, South Central, Northeastern, Eastern, Southeastern

US Regional Goals
BSE Surveillance (through 12/31/03)

FY01
Goal
FY01FY02
Goal
FY02FY03
Goal
FY03FY04
Goal
FY04
NW5646951,2052,2241,2057814832489
SW4665641,9762,7531,9763,6454172470
C7663321,5902,3561,5902,62866401403
SC7348721,5091,8101,5091,69063801251
NC6066202,5613,7802,5615,62051801990
NE4628052,1402,1902,1402,59539121004
E3124013631,3813635142644507
SE6449531,0053,1561,0052,80055801030

BSE Surveillance: Yearly totals May 1990 - FY 2004 (thru 12/31/2003)

BAR GRAPH - datasheet provided below.

199019911992199319941995199619971998199920002001200220032004
NVSL2273674124954655848567319932305487019777202778150
VDL's181021843241972793951857349309376402213266
CDC 163

Surveillance: NVSL Bovine Brain Submissions FY 93-04 (through 12/31/03)

BAR GRAPH - datasheet provided below.

93949596979899'00'01'02'03'04
Total Submissions4124954655848557319882309487019777202778150
Downers (fallen stock) 1992232662193446511895446414951165606360
Dead stock 275930901266

Adustments to U.S. BSE Surveillance?

  • Our surveillance objective remains the same
  • Have taken an even more conservative approach by re-evaluating the size of our at-risk population and increasing the number sampled
  • Bulk of the sampling still dead and non-ambulatory animals (on farm, renderers, pet food plants)
  • Will adjust geographic sampling distributions if needed

What are we asking of FSIS?

  • Call APHIS-Veterinary Services if you condemn an adult animal ante-mortem for CNS signs - as requested in the past
  • Call APHIS-Veterinary Services if you condemn an adult animal ante-mortem for non-ambulatory disabled.
Last Modified Dec 30, 2016