Addition or return of birds to passed or clean flocks

(a) All hatching eggs, chicks or poultry to be added to pullorum-typhoid passed or pullorum-typhoid clean flocks under supervision shall be approved by the commissioner before purchase. (b) All birds returned to pullorum-typhoid passed and pullorum-typhoid clean flocks from poultry exhibits or egg-laying contests or after being removed from the premises for any purpose whatsoever shall be quarantined until birds from pullorum-typhoid passed flocks have passed one clean test and birds from pullorum-typhoid clean flocks have passed two clean tests at least twenty-one days apart. If a reactor is found, all birds under quarantine shall be disposed of.