On Tuesday, Bill Gates asked for bigger, stronger programs of immunization against infectious diseases in an effort to save the lives of 4-million people by 2015 and 10 million by 2020, saying it would be the best investment possible into global health as a whole.

Mr. Gates was one of the keynote speakers at the yearly meeting of the World Health Organization in Geneva, which was attended by health ministers from 193 member countries of the United Nations.

As he described his Decade of Vaccines movement, he paid compliments to international health organizations, individual companies, and governmental bodies for all their previous work in providing vaccines to poorer nations. He also acknowledged that lots of health ministers faced difficult tasks, especially in regards to the limited resources available.

“But you all have access to one key resource: your own leadership”, said Mr. Gates. “And leadership can be decisive… The best immunization systems work because leaders hold themselves accountable for results. They diagnose problems, innovate to solve them, and spread the best ideas”.

The founder of the computer giant Microsoft outlined six different vaccines that he would like to see available within 10 years, topping off his list with the complete eradication of polio.