Serum titers were tested by mouse neutralization test.

采用小鼠中和试验测定血清效价。

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The more serious the infection, the serum antibody titers. was much higher.

感染度越重血清抗体滴度越高。

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The more serious the infection, the serum antibody titers. was much higher.

感染度越重血清抗体滴度越高。

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