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Biotech vaccine okayed.

Biotech vaccine okayed

The Food and Drug Administration this week approved a hepatitis vaccine made by yeast saddled with hepatitis B virus genes (SN:7/27/85,p.55). The approval is the first for a genetically enginerred human vaccine and for a human pharmaceutical produced by yeast. While there is already a hepatitis B vaccine on the market, it is derived from blood. According to the July 24 NEW ENGLAND JOURNAL OF MEDICINE, the efficacy of the blood-derived vaccine can drop substantially over time: 15 percent of 635 men lost all protection within five years of vaccination.
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Publication:Science News
Date:Jul 26, 1986
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