Smallpox Vaccinations Health officials prepare to vaccinate millions of Americans against smallpox following last week's revelation that four nations have been stockpiling the virus. NPR's Richard Knox reports.

Officials Prepare Smallpox Vaccinations

Officials Prepare Smallpox Vaccinations

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Health officials prepare to vaccinate millions of Americans against smallpox following last week's revelation that four nations have been stockpiling the virus. NPR's Richard Knox reports.