What was Fleming's share of the 1945 Nobel Prize?

What was Fleming’s share of the 1945 Nobel Prize? His share was one third.

Alexander Fleming received one third of the 1945 Nobel Prize in Physiology or Medicine. The prize was divided equally among Fleming, Howard Florey and Ernst Chain for the discovery of penicillin and its curative effect in various infectious diseases.

The equal division reflected the Nobel Assembly’s final decision, although the deliberations reportedly considered giving Fleming one half and Florey and Chain one quarter each. The award therefore did not give Fleming the whole prize, despite the widespread public image of him as penicillin’s sole discoverer.

Fleming discovered penicillin’s antibacterial effect in 1928, but Florey and Chain led the later Oxford work that purified, tested and developed it into a treatment. Their complementary contributions explain why all three scientists were recognized together in 1945.