1.When the presence of bluetongue is officially confirmed, the official veterinarian shall:
(a)proceed, informing the Commission thereof, with the slaughter deemed necessary to prevent extension of the epidemic;
(b)order the destruction, elimination, incineration or burial of the carcases of those animals, in accordance with Directive 90/667/EEC;
(c)extend the measures provided for in Article 4 to holdings located within a radius of 20 kilometres (including the protection zone defined in Article 8) around the infected holding or holdings;
[F1(d) implement the measures adopted in accordance with the procedure laid down in Article 20(2), in particular with regard to the introduction of any vaccination programme or other alternative measures;]
(e)carry out an epidemiological survey in accordance with Article 7.
However, by way of derogation from subparagraph (c), provisions applicable to movements of animals in the zone may be adopted in accordance with the procedure laid down in Article 20(2).
2.The zone referred to in paragraph 1(c) may be extended or reduced on the basis of epidemiological, geographical, ecological or meteorological circumstances by the competent authority which shall notify the Commission thereof.
3.Where the zone referred to in paragraph 1(c) is located on the territory of more than one Member State, the competent authorities of the Member States concerned shall cooperate in order to demarcate the zone. If necessary, the zone shall be demarcated according to the procedure laid down in Article 20(2).