Acute infectious bursal disease in poultry: Protection afforded by maternally derived antibodies and interference with live vaccination

Abstract excerpt

Maternally derived antibodies (MDA) were found insufficient to protect broiler chicks against a highly pathogenic strain of IBDV during the growing period even if the parent flocks had been boostered at point of lay by using oil emulsion vaccines. Whatever the vaccination scheme of the parent flocks, maximum mortality was observed after a challenge performed at 38 days of age in broiler and layer chicks,...

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