Penicillin nontoxic in humans by first performing toxicity tests in animals and then on humans. His subsequent experiments on penicillin's response to heat and pH allowed Fleming to increase the stability of the compound. The one test that modern scientists would find missing from his work was the test of penicillin on an infected animal, the results of which would likely have sparked great interest in penicillin and sped its development by almost a decade. The importance of his work has been recognized by the placement of an International Historic Chemical Landmark at the Alexander Fleming Laboratory Museum in London on
History of penicillin and subsequently concentrated what he later named "penicillin". During the next twelve years, Fleming grew and distributed the original mold, which was eventually identified as "Penicillium notatum" (now known as "Penicillium chrysogenum"). He was unsuccessful in making a stable form of it for mass production. Cecil George Paine, a pathologist at the Royal Infirmary in Sheffield, attempted to treat sycosis (eruptions in beard follicles) with penicillin but was unsuccessful, probably because the drug did not penetrate deep enough. Moving on to ophthalmia neonatorum, a gonococcal infection in babies, he achieved the first cure on 25 November 1930. He cured four