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Vaccination is often considered as an appropriate option in prevention most of poultry viral diseases worldwide. This study was conducted to evaluate effects of current routine vaccination routes (spray, eye-drop and drinking water) of live vaccines against infectious bronchitis (IB) on performance and humoral immune responses of broiler chickens. The results of this study indicated that Vaccination significantly (P<0.05) affects performance of the broiler chickens and effects on weight gaindoi:10.3923/ijps.2005.795.798 fatcat:42pcr2qypvbh7fixtvmcoet6fq