[F1 [F2B. A herd shall retain officially enzootic-bovine-leukosis-free status provided: U.K.
(i)
the condition in A(i) continues to be fulfilled;
(ii)
any animals introduced into the herd come from an officially enzootic-bovine-leukosis-free herd;
(iii)
all animals over 24 months of age continue to react negatively to a test carried out in accordance with Chapter II at intervals of three years;
(iv)
breeding animals introduced into a herd and originating from a third country have been imported in accordance with Directive 72/462/EEC.] ]