Newcastle disease immunity in broilers and caponettes vaccinated with killed-virus and live-virus vaccines

Dardiri, A.H.; Yates, V.J.; Chang, P.W.; Fry, D.E.

American Journal of Veterinary Research 22: 93-98


ISSN/ISBN: 0002-9645
PMID: 13719739
Accession: 014118121

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A single dose of killed or living Newcastle disease vaccine at the age of 2 or 4 weeks did not protect 128 chicks adequately against intratracheal challenge with virulent virus 4-20 weeks later. But all of 252 chicks immunized with killed vaccine at 2 weeks followed by killed or living vaccine at the age of 4-6 weeks were immune to challenge up to the age of 22 weeks. Chicks given both living Newcastle disease vaccine and infectious bronchitis vaccine when 2 weeks old developed infections of the air sacs, from which Escherichia coli was isolated (but not PPLO).