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。
At the end of the four-month study, both groups were given milk powder as a "challenge" to see what dose would cause reaction after the treatment.
在四个月的研究末，两组儿童给予奶粉作为一种“挑战”看在治疗之后他们的反应是怎么样的。
The challenge has been how to make the maximum number of shots from the minimum amount of antigen, as if a lower dose is needed, more people can be given the shot.
现在面临的挑战是怎样以最少的抗原来产生最多的注射数，因为如果所需的剂量较低，就会有更多的人能接受注射。
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