Spray vaccination of turkeys against Newcastle disease.
Turkeys poults were vaccinated against Newcastle disease by spray vaccination using Hitchner B1 and La Sota vaccines. Turkeys with maternally derived immunity vaccinated at 7, 35 and 63 days of age developed an active immunity. Each revaccination resulted in higher levels of haemagglutination-inhibiting and neutralising antibodies. Challenge with virulent virus showed that turkeys, serologically free from antibodies against Newcastle disease were less sensitive than specific pathogen free chicks to Newcastle disease.
Yadin
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Poultry Department, Central Veterinary Institute, Doorn, The Netherlands.