We also administered a challenge dose of monovalent type 1 oral poliovirus vaccine at 7 months and collected stool samples before and 7 days after administration of the challenge dose.

同时，在7个月时给予一剂激发剂量的单价1型口服脊髓灰质炎疫苗，并分别采集给服激发剂量7天前、后的大便标本。

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We also administered a challenge dose of monovalent type 1 oral poliovirus vaccine at 7 months and collected stool samples before and 7 days after administration of the challenge dose.

同时，在7个月时给予一剂激发剂量的单价1型口服脊髓灰质炎疫苗，并分别采集给服激发剂量7天前、后的大便标本。

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