Division II Specific criteriaF1

Live attenuated Newcastle disease vaccines must be prepared from a Newcastle disease virus strain for which the master seed has been tested and shown to have an intracerebral pathogenicity index (ICPI) of:

1. (a)

   less than 0,4, if not less than 10 ⁷ EID ₅₀ are administered to each bird in the ICPI test; or

2. (b)

   less than 0,5, if not less than 10 ⁸ EID ₅₀ are administered to each bird in the ICPI test.