. . . . . . . "rian before such premises are again used for livestock or poultry. (b) Yards, pens, chutes, alleys, and other facilities and premises which have contained interstate shipments of cattle, sheep, swine, poultry, or other animals affected with, or carrying the infection of, any contagious, infectious, or communicable disease of livestock or poultry other than slight unopened cases of actinomycosis or" . .