Member States shall ensure that:

1. (i)

   all female animals and all bulls from type B₁ herds destined for type B₂ herds:

   • if more than 12 months old, have passed an officially approved serological test carried out within the 30 days prior to movement and are accompanied by a certificate to this effect from the official veterinarian,

   • are isolated immediately upon arrival for at least 60 days and if more than 12 months old, have passed a further officially approved serological test before admission to the type B₂ herd;

2. (ii)

   all female animals and all bulls from a type B₂ herd destined for another type B₂ herd:

   • if more than 12 months old, have passed an officially approved serological test carried out within the 30 days prior to movement and are accompanied by a certificate to this effect from the official veterinarian,

   • do not come into contact, during transfer, with animals from herds of a lower health status;

3. (iii)

   transfers of animals between B₃ and B₄ herds are carried out subject to the observance of the requirements of Directive 64/432/EEC.