Traditional live Infectious Bursal Disease virus (IBDV) vaccines were thought to have some degree of adverse effect on bursa of fabricous of chickens, which in turn may interfere with antibodies production against other poultry vaccines. In this study, 15 broiler flocks vaccinated against avian influenza (AI) virus were sampled for serum. The flocks have received IBDV vaccination either by the conventional live vaccines or with the new recombinant subunit vaccine. Haemagglutination inhibition (HI) test were carried on sera using different AI antigens. Sera measured by the variant A/chicken/Egypt/VRLCU67/2011(H5N1) isolate showed significant difference (P
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