01/29/2011 12:45 pm ET Updated Dec 06, 2017

Vaccines Save Lives

My third annual letter was recently released. One of the major themes of the letter is the miracle of vaccines. Last year, Melinda and I announced that we were working together with partners to make this the Decade of Vaccines, and I wanted to use this year's letter to explain why.

In particular, my letter focuses on the vaccine for polio, since it's helped the world get to the threshold of something amazing: eradicating the disease altogether. We're incredibly close and we need to finish the job.

We put together a video, called Vaccines Save Lives, to try to describe why vaccines are a miracle in a vivid way. I hope you enjoy it -- and share it with your friends.

Read the 2011 Annual Letter from Bill Gates.