Paragraph 32
England and Wales
Newcastle disease (avian paramyxovirus type 1) viruses which are—
(a)
uncharacterised; or
(b)
have an intracerebral pathogenicity index in one-day-old chicks of 0.4 or more, when not less than 10 million 50% egg infectious doses (EID50) are administered to each bird in the test.