Scientist Discovery Lives Saved Abel Wolman (1892–1989) and Linn Enslow (1891–1957) chlorination of water 177 million William Foege (1936– ) smallpox eradication strategy 131 million Maurice Hilleman (1919–2005) eight vaccines 129 million John Enders (1897–1985) measles vaccine 120 million Howard Florey (1898–1968) penicillin 82 million Gaston Ramon (1886–1963) diphtheria and tetanus vaccines 60 million David Nalin (1941– ) oral rehydration therapy 54 million Paul Ehrlich (1854–1915) diphtheria and tetanus antitoxins 42 million Andreas Grüntzig (1939–1985) angioplasty 15 million Grace Eldering
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