Fig. 3From: Screening and identification of B-cell epitopes within envelope protein of tembusu virusAntibody titer of ducks immunized with B cell epitopes. Groups of 9-day-old duck were immunized twice with P21, P23, P27, P28, entire E protein and PBS by intramuscular injection at 2Â weeks interval. Serum samples were collected at 2Â weeks after last boost and antibody titer was assessed by indirect ELISABack to article page