The farmed game bird flock from which the meat originates:
(a) ...,
(b) has undergone at slaughter, on the basis of a random sample of cloacal swabs from at least 60 birds from each flock concerned, a virus isolation test for Newcastle disease, carried out in an official laboratory, in which no avian paramyxoviruses with an Intravenous Pathogenicity Index (IVPI) of more than 0.4 were found; ...