Polio is a highly infectious disease caused by a virus. It invades the nervous system and can quickly cause paralysis. Thanks to global immunization campaigns, polio has been reduced by 99 percent globally, and eradication is within reach. We've even provided this handy and visually pleasing infographic to give you a better sense of how close we really are.

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We are so close to eradicating polio. This crippling disease, which largely has been forgotten in the United States and Europe because of successful vaccination programs, still threatens children in a number of places around the world.

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Today, Bill Gates and a panel of experts met at the Roosevelt House in New York City to launch Bill’s annual letter and to discuss the extraordinary progress in the fight to eradicate polio and the enormous lifesaving potential of vaccines.

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In 1988, I was assigned by the US Centers for Disease Control and Prevention (CDC) to help investigate an outbreak of polio, the first polio investigation of my career.

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I will never forget March 16, 1975. It had been almost four months since I began working in India’s largest state, Uttar Pradesh (UP), to try to eradicate smallpox. 

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