In 1928, Sir Alexander Fleming, working at St. Mary's Hospital in London, observed that a bluishgreen mold had contaminated a culture of Staphylococcus, and that the areas of the Staphylococcus bacteria nearest to the mold were being destroyed. Upon testing a pure culture of this mold, Fleming discovered that the mold killed many types of bacteria. He named the substance penicillin and published his results in 1929. It was not, however, until over a decade later that a team of researchers from Oxford, aided by an American laboratory, were able to increase the growth rate of penicillin – by then recognized to be the strongest antibacterial agent known at that time – such that enough of it could be produced to treat Allied soldiers wounded on D-Day, in 1944.