Iowa Code Title V. Agriculture [Chs. 159-215A] § 163A.7. Reactor tag

All swine showing a positive reaction to the brucellosis test shall be tagged in the left ear with a reactor identification tag and moved to slaughter on such form as shall be designated by the department within a thirty-day period from the date of test. The herd of origin shall be placed under immediate quarantine to be retested no sooner than thirty days or later than sixty days from the date of the test showing the positive reaction. Such quarantine shall remain in effect until a complete negative herd test is conducted on all swine intended or used for breeding purposes.