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Summary
A new study has found that the 15.4 million doses of aging smallpox vaccine currently in the U.S. stockpile--an amount considered woefully inadequate--can be safely diluted by a factor of 5 or 10 without losing their potency. And, in another unexpected windfall, Aventis Pasteur has just announced that it plans to donate to the government about 85 million additional doses of a similar vaccine that have been stored in its freezers for about 40 years.
