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WASHINGTON (AP) - An experimental smallpox vaccine appears to work nearly as well as an older vaccine in protecting against the deadly virus, according to federal documents released Tuesday.
The newer vaccine, ACAM2000, showed by separate measures that it would be nearly as effective as the older vaccine, Dryvax. ACAM2000 is derived from Dryvax, which is no longer made. Both vaccines pose similar risks of serious side effects, including itch, rash and pain as well as rare cases of inflammation of the heart and surrounding sac.
The FDA released its review of studies of the vaccine ahead of an advisory committee meeting Thursday.
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