Efter fremgangsmaaden i artikel 18 kan det besluttes, at stk. 1 skal gaelde for en del af en medlemsstats omraade, hvis alle ornestationerne i denne del af omraadet udelukkende har dyr, der har reageret negativt paa serumneutralisationsundersoegelsen eller Elisa-undersoegelsen for Aujeszkys sygdom.
In accordance with the procedure referred to in Article 18, it may be decided to extend the provisions of paragraph 1 to part of the territory of a Member State if all the collection centres in that part of the territory contain only animals giving a negative reaction to the serum neutralization test or the ELISA test for Aujeszky's disease.