21—64.4 (163) “Exposed” defined. An animal must be considered as “exposed” when it has stood in a stable with, or been in contact with, any animal known to be affected with a contagious, infectious or transmissible disease; or if placed in a stable, yard or other enclosure where such diseased animal or animals have been kept unless such stable, yard or other enclosure has been thoroughly cleaned and disinfected after containing animals so affected.
This rule is intended to implement Iowa Code section 163.1.