同时对免疫的雏鸭采血，中和试验测定血清的效价。

The serum of the immunized ducklings were collected and the antibody titer were measured by neutralizing test.

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采用小鼠中和试验测定血清效价。

Serum titers were tested by mouse neutralization test.

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采用小鼠中和试验测定血清效价。

Serum titers were tested by mouse neutralization test.

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