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  • Title: Efficacy of viable and inactivated Newcastle disease virus vaccines in turkeys.
    Author: Kelleher CJ, Halvorson DA, Newman JA.
    Journal: Avian Dis; 1988; 32(2):342-6. PubMed ID: 3401177.
    Abstract:
    Market turkeys spray-vaccinated at 20 days of age with viable Newcastle disease virus (NDV) vaccine and challenged 7 weeks postvaccination failed to yield NDV by tracheal swabbing 4 days postchallenge but demonstrated serologic evidence of infection. Birds vaccinated subcutaneously with inactivated oil-emulsion (OE) NDV vaccine had virologic and serologic evidence of infection. Breeder hens vaccinated by spray with commercial La Sota vaccine at 19 weeks of age and revaccinated subcutaneously with OE vaccine at 32 weeks of age had an adequate level of resistance against a drop in egg production but demonstrated serologic evidence of infection when challenged with velogenic NDV at 38 weeks of age.
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