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The vaccine produced a strong immune response and fewer lesions than ACAM2000.
Marshals sieze 5 vials of vaccinia virus vaccine, reserved only for those at high risk of smallpox.
Panel finds overall response was thorough, but notes policy gaps and some missteps after the samples were found.
Though the technology isn't likely within reach of do-it-yourselfers, it could already be in use by rogue governments, experts say.
Besides leading smallpox eradication, Henderson is also known for his role in shaping public health education and for instilling passion for solving infectious disease problems.
The lab worker was infected after a needlestick injury, despite receiving the vaccine 10 months prior.
A recent vaccinia infection in a US Air Force trainee was facilitated by shaving and caused serious facial lesions that required a long hospital stay.
In addition to recent problems with anthrax and smallpox, high-path avian flu has now entered the mix.
Testing to determine whether the vials contain live virus will take 2 weeks, the CDC said.
Seven of the 26 exposed workers had been vaccinated against smallpox, and only 1 of them got infected.
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