For at gøre det lettere at vurdere betydningen af de opnåede testresultater skal den samme stamme (eller registrerede oprindelse) af hver af de relevante arter så vidt muligt benyttes til de forskellige specificerede test.
In order to facilitate the assessment of the significance of test results obtained, the same strain (or recorded origin) of each relevant species shall, where possible, be used in the various tests specified.