Alexander Fleming — "The public will probably never understand the difficulties that beset the path o…"

"The early days of penicillin were full of disappointments, but we never gave up."

"The time may come when penicillin can be bought by anyone in the shops. Then there is the danger that the ignorant man may easily underdose himself and by exposing his microbes to non-lethal quantitie…"

"The story of penicillin has been told so often that it is almost a cliché."

"My work was not a flash of genius, but a gradual unfolding of facts."

"I have been asked to say a few words about the discovery of penicillin. I must confess that I have been asked to do this so often that I am beginning to be a little tired of it."