填空题

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

【参考答案】

SV40

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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.

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The AIDS virus is very delicate and can be killed by being ex posed to air or stomach acid.