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  • Title: Serological response in broiler chicks to different commercial Newcastle disease and infectious bronchitis vaccines.
    Author: Halvorson DA, Shaw D, Sivanandan V, Barbour EK, Maheshkumar S, Newman JA, Newman L.
    Journal: Avian Dis; 1991; 35(4):978-81. PubMed ID: 1664724.
    Abstract:
    Broiler chicks were administered vaccines against Newcastle disease and infectious bronchitis (both Arkansas and Massachusetts strains) at 2 weeks of age as either primary or secondary vaccinations. The vaccine was administered as a spray at 2 weeks of age to chicks that had received Newcastle disease vaccine alone, bronchitis vaccine alone, both vaccines in combination, or no vaccine at day 1 in the hatchery. The Newcastle disease hemagglutination-inhibition response was significantly lower in chicks receiving Newcastle disease vaccine as a secondary vaccine at 2 weeks than in those receiving the vaccine as a primary vaccination at that age. In contrast, the bronchitis hemagglutination-inhibition response was significantly higher in chicks receiving bronchitis vaccine as a secondary vaccination at 2 weeks than in those receiving the vaccine as a primary vaccination at that age.
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