填空题

The Sabin vaccine was given most often on ______, but Koprowski’s vaccine was squirted into people’s mouths.

【参考答案】

a sugar cube

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填空题

______ was not discovered until 1961, and the U.S. Food and Drug Administration has since acted to ensure against similar contaminations.

填空题

Sabin and Koprowski created their vaccines by culturing a strain of polio virus on monkey kidneys, supposedly the source of ______, now called SIV.