search    contact us
THE DANGER
THE VACCINE
THE PRIORITY
THE STRATEGY
adverse event info
education toolkit
resource center
my vaccination
smallpox overview

Last Updated:
12 Nov 14

header image    sitemap    home
title
seperator
  arrow Efficacy
seperator
  arrow Side Effects
seperator
  arrow Site Care
seperator
  arrow Exemptions
seperator


Efficacy: The World Health Organization successfully used smallpox vaccine to eradicate natural smallpox from the planet.
dots


  • 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.