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'''Alexander Fleming''' the Scottish physician and microbiologist (1881-1955) who discovered penicillin, the first widely used antibiotic, and whose work launched the antibiotic era of medicine. A careful and observant laboratory scientist, he shared the Nobel Prize in Physiology or Medicine in 1945 for the discovery that made bacterial infections treatable and saved millions of lives.

== Early Life and Education ==
Alexander Fleming was born at Lochfield, a farm near Darvel in Ayrshire, Scotland, the seventh of eight children in a farming family. He attended local schools and then moved to London, where he worked in a shipping office and studied at the Regent Street Polytechnic before entering St Mary's Hospital Medical School, from which he qualified as a physician.

He was a talented marksman and swimmer and might have pursued a career in sport, but he chose to remain in research. He worked in the laboratory of Almroth Wright, a pioneer of vaccine therapy, and became a skilled and inventive bacteriologist, known for his technical ingenuity and for his wide reading of the scientific literature.

During the First World War he served in the Royal Army Medical Corps and worked on wound infections in field hospitals in France. He observed that antiseptics applied to deep wounds often did more harm than good, killing the body's own defensive cells and leaving the bacteria in the deeper tissue untouched, an experience that shaped his belief in the need for agents that could attack bacteria internally.

== The Discovery of Penicillin ==
In 1928 Fleming was working at St Mary's Hospital on cultures of staphylococcus bacteria when he returned from a holiday to find that a mould had contaminated one of his culture plates. Around the mould the bacteria had been destroyed, leaving a clear zone in which they had failed to grow, and he recognised that the mould was producing a substance that killed the bacteria.

He identified the mould as a species of Penicillium and named the antibacterial substance it produced penicillin. He found that it was active against a range of bacteria while being harmless to animal cells, and he published his observations, but he lacked the chemical skills needed to purify and stabilise the substance in sufficient quantity for use as a medicine.

The discovery attracted little attention at first, and Fleming himself did not pursue its therapeutic development. He did, however, keep cultures of the mould and continued to mention penicillin in his lectures and papers, so that the observation was not forgotten and could later be taken up by others.

== Development into a Medicine ==
In the late 1930s Howard Florey and Ernst Chain at Oxford, working on antibacterial substances produced by microorganisms, came across Fleming's paper and began to investigate penicillin seriously. With the biochemist Norman Heatley they developed methods for growing the mould in quantity and for extracting and purifying the active substance, and they demonstrated that it could cure infections in mice and then in human patients.

The timing was critical, because the Second World War produced large numbers of infected wounds, and the demand for an effective antibacterial agent was urgent. With government support and later collaboration with American pharmaceutical companies, production methods were scaled up, and by the middle years of the war penicillin was available in sufficient quantity to treat casualties and save many lives.

Fleming's contribution was to recognise the significance of the contaminated culture and to describe the antibacterial effect. The translation of that observation into a medicine depended on the work of the Oxford team and the manufacturing effort, and Fleming readily acknowledged the importance of their contribution while retaining credit for the initial discovery.

== Recognition and Later Life ==
In 1945 Fleming, Florey and Chain were awarded the Nobel Prize in Physiology or Medicine for the discovery of penicillin and its therapeutic effect. Fleming was knighted and became one of the most celebrated scientists in the world, receiving honours from many countries and becoming a sought-after speaker and public figure.

He warned in his Nobel lecture that the careless use of antibiotics could lead to the emergence of resistant bacteria, noting that bacteria could develop resistance when exposed to concentrations of the drug too low to kill them. This warning, made at the very beginning of the antibiotic era, proved prophetic and remains central to modern infectious disease medicine.

He spent his later years as director of the Wright-Fleming Institute at St Mary's Hospital, where he continued to work and to advise, and he died in London in 1955. His modest and unassuming character, combined with the magnitude of his discovery, made him a widely admired figure.

== Influence and Legacy ==
The discovery of penicillin opened the antibiotic era and transformed medicine. Diseases such as pneumonia, meningitis, puerperal fever and infected wounds, which had killed people in huge numbers, became treatable with drugs, and surgery and childbirth became far safer as a result. The discovery is often described as one of the most important medical advances of the twentieth century.

Penicillin stimulated the search for other antibiotics, and the mid-twentieth century saw the discovery of streptomycin, tetracyclines, cephalosporins and many other classes of antibacterial drugs. The antibiotic industry became a major part of the pharmaceutical sector, and vaccination and antibiotic therapy together reshaped the pattern of human mortality.

Fleming's concern about resistance has become one of the central challenges of modern medicine, as resistant strains of bacteria have emerged and the supply of new antibiotics has slowed. His name is associated with research institutes and awards, and he is remembered both for the lucky observation that began the antibiotic age and for the warning that the age would not last unless the drugs were used with care.

== See also ==
* Penicillin
* Antibiotic
* Antibiotic resistance
* Howard Florey

== References ==

<ref name="r1">Alexander Fleming, Penicillin: Its Practical Application, Butterworth, 1946.</ref>
<ref name="r2">Gwyn Macfarlane, Alexander Fleming: The Man and the Myth, Chatto and Windus, 1984.</ref>
<ref name="r3">Andre Maurois, The Life of Sir Alexander Fleming, Jonathan Cape, 1959.</ref>
<ref name="r4">David Wilson, In Search of Penicillin, Alfred A. Knopf, 1976.</ref>

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[[Category:Science]]
[[Category:Medicine]]
[[Category:Scotland]]

Alexander Fleming - Revision history

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