Certificates

(a) When a flock has been found to be free of any evidence of pullorum-typhoid disease by one tube agglutination test made on all poultry on the premises, the flock shall be designated as pullorum-typhoid passed and a pullorum-typhoid passed certificate issued by the commissioner. (b) When a flock has been found to be free of any evidence of pullorum-typhoid disease on two consecutive tube agglutination tests, made at intervals of not less than twenty-one days on all poultry five months of age or over on the premises, the flock shall be designated as pullorum-typhoid clean and a pullorum-typhoid clean certificate issued by the commissioner. (c) When a flock originating from a pullorum-typhoid passed or a pullorum-typhoid clean flock has been found to be free of any evidence of pullorum-typhoid disease by one tube agglutination test on all poultry five months of age or over on the premises, the flock shall be designated as pullorum-typhoid clean and a pullorum-typhoid clean certificate issued by the commissioner. (d) Any flock may be pronounced clean on the completion of two consecutive clean tests not less than twenty-one days apart, the last being made within the testing year immediately preceding the date of sale of hatching eggs or chicks from such flocks.