veterinary services centers for epidemiology and animal health march 2004 _________________________________________________________________________________________________________________________ highlights of phase ii scrapie ovine slaughter surveillance study 2002 2003 the purpose soss was to estimate regional national prevalence in mature cull sheep united states i conducted from february 2001 through included refinement design sample collection training develop modify testing processes without emphasizing statistical results is similar that procedures were used along with a representative allocation beginning april 1 continuing 31 tissue samples 12 508 22 plants throughout 21 fsis inspected state plant large livestock market texas represented approximately two thirds total slaughtered during period one half live exported mexico all data statistically weighted reflect population which
