The serum of the immunized ducklings were collected and the antibody titer were measured by neutralizing test.
同时对免疫的雏鸭采血，中和试验测定血清的效价。
Of three forms of S recombinant proteins, only S or S1 protein induced neutralizing antibody responses, antibody titer was increased by S protein immunization.
其中，仅S和S1蛋白重组质粒能够诱导中和抗体的产生，以S蛋白的效价为高。
Of three forms of S recombinant proteins, only S or S1 protein induced neutralizing antibody responses, antibody titer was increased by S protein immunization.
其中，仅S和S1蛋白重组质粒能够诱导中和抗体的产生，以S蛋白的效价为高。
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