Show tuberculosis on decline two thirds of all counties in the united states now are virtually free fre of bovine tuberculosis according to th the agricultural department since tuber colln testing began in 1917 infection among cattle has been reduced to a minimum in 2035 counties or per cent of all countries the department said eighteen states have been besig bated officially as modified accredited areas signifying that tuberculosis among cattle has been reduced to less one half of one per cent t i |