
Seventy-three years ago Tuesday, on June 6, 1944, the D-Day invasion of Normandy was bolstered by millions of doses of a precious new substance: penicillin. On the other side of the Atlantic, researchers at the University of Wisconsin–Madison and other institutions had spent the last three years pursuing advances in penicillin production. Though discovered 16 years prior, the world’s first natural antibiotic was expensive and difficult to wring from the mold that makes it. By discovering new strains, isolating more productive mutants, and improving growing methods, UW-Madison biologists helped supply Allied troops with enough penicillin to treat life-threatening infections.





























