The programs that the foundation backs have made progress against some diseases, Gates writes, especially those that cause childhood deaths.
But he says he's disappointed with the slow progress in coming up with effective and affordable AIDS vaccines. Gates admits that many of the investments the foundation has made in education haven't improved students' achievement in any significant way, but he says some charter schools achieved some notable successes.
He urges state governments to permit more charter schools to be established and to increase their funding.
While the Gates Foundation is increasing its program investments this year, it doesn't plan to expand into new focus areas.
"I'm a believer that foundations in general work on too many causes," Gates said during the press conference. "If they worked on half as many causes and went deeper on a few things, the impacts would be greater."
Image: Bill Gates, co-founder of the Bill & Melinda Gates Foundation gives a baby an oral polio drop at the Shadnagar community health clinic in Andhra Paradesh. Photograph: Jeff Christensen/Reuters
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