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Last Updated:
21 May 13 |
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- Smallpox vaccine contains live vaccinia viruses. Once administered, it evokes an immune response that protects against variola virus, the virus that causes smallpox.
- Smallpox vaccine is so effective that it eradicated the natural disease from the planet.
- About 95% of people are protected within 10 days of getting a single smallpox vaccination.
- Smallpox vaccination up to 3 days after someone is exposed to smallpox virus will prevent or reduce the severity of smallpox in most people. Vaccination 4 to 7 days after exposure will likely offer partial protection.
- Solid protection lasts for 3 to 5 years after first vaccination. Solid protection after revaccination lasts about 10 years. Partial protection lasts longer, but people need to be revaccinated if too much time has passed.
- Published studies show that diluted smallpox vaccine is as effective as full-strength vaccine.
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