Alexander Fleming

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This article is about the biologist. For other uses, see Alexander Fleming (disambiguation).
Sir Alexander Fleming
Synthetic Production of Penicillin TR1468.jpg
Born (1881-08-06)6 August 1881
Lochfield, East Ayrshire, Scotland
Died 11 March 1955(1955-03-11) (aged 73)
London, England
Citizenship British
Fields Bacteriology, immunology
Alma mater
Known for Discovery of penicillin
Notable awards

Sir Alexander Fleming, FRSE, FRS,[1] FRCS(Eng) (6 August 1881 – 11 March 1955) was a Scottish biologist, pharmacologist and botanist. His best-known discoveries are the enzyme lysozyme in 1923 and the antibiotic substance benzylpenicillin (Penicillin G) from the mould Penicillium notatum in 1928, for which he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Florey and Ernst Boris Chain.[2][3][4][5][6][7] He wrote many articles on bacteriology, immunology, and chemotherapy.

Early life and education[edit]

Fleming was born on 6 August 1881 at Lochfield farm near Darvel, in Ayrshire, Scotland. He was the third of the four children of farmer Hugh Fleming (1816–1888) from his second marriage to Grace Stirling Morton (1848–1928), the daughter of a neighbouring farmer. Hugh Fleming had four surviving children from his first marriage. He was 59 at the time of his second marriage, and died when Alexander (known as Alec) was seven.

Fleming went to Loudoun Moor School and Darvel School, and earned a two-year scholarship to Kilmarnock Academy before moving to London, where he attended the Royal Polytechnic Institution.[8] After working in a shipping office for four years, the twenty-year-old Fleming inherited some money from an uncle, John Fleming. His elder brother, Tom, was already a physician and suggested to his younger sibling that he should follow the same career, and so in 1903, the younger Alexander enrolled at St Mary's Hospital Medical School in Paddington; he qualified with an MBBS degree from the school with distinction in 1906.

Fleming had been a private in the London Scottish Regiment of the Volunteer Force since 1900,[2] and had been a member of the rifle club at the medical school. The captain of the club, wishing to retain Fleming in the team suggested that he join the research department at St Mary's, where he became assistant bacteriologist to Sir Almroth Wright, a pioneer in vaccine therapy and immunology. In 1908, he gained a BSc degree with Gold Medal in Bacteriology, and became a lecturer at St Mary's until 1914. Fleming served throughout World War I as a captain in the Royal Army Medical Corps, and was Mentioned in Dispatches. He and many of his colleagues worked in battlefield hospitals at the Western Front in France. In 1918 he returned to St Mary's Hospital, where he was elected Professor of Bacteriology of the University of London in 1928. In 1951 he was elected the Rector of the University of Edinburgh for a term of 3 years.


Work before penicillin[edit]

Following World War I, Fleming actively searched for anti-bacterial agents, having witnessed the death of many soldiers from sepsis resulting from infected wounds. Antiseptics killed the patients' immunological defences more effectively than they killed the invading bacteria. In an article he submitted for the medical journal The Lancet during World War I, Fleming described an ingenious experiment, which he was able to conduct as a result of his own glass blowing skills, in which he explained why antiseptics were killing more soldiers than infection itself during World War I. Antiseptics worked well on the surface, but deep wounds tended to shelter anaerobic bacteria from the antiseptic agent, and antiseptics seemed to remove beneficial agents produced that protected the patients in these cases at least as well as they removed bacteria, and did nothing to remove the bacteria that were out of reach. Sir Almroth Wright strongly supported Fleming's findings, but despite this, most army physicians over the course of the war continued to use antiseptics even in cases where this worsened the condition of the patients. [9]

At St Mary’s Hospital Fleming continued his investigations into antibacterial substances. Testing the nasal secretions from a patient with a heavy cold, he found that nasal mucus had an inhibitory effect on bacterial growth.[10] This was the first recorded discovery of lysozyme, an enzyme present in many secretions including tears, saliva, human milk as well as mucus. Lysozyme degrades the bonds in bacterial peptidoglycan cell walls, particularly in Gram-positive organisms. Unfortunately, lysozyme had little therapeutic potential.

Accidental discovery[edit]

Miracle cure.
Main article: History of penicillin

"When I woke up just after dawn on September 28, 1928, I certainly didn't plan to revolutionise all medicine by discovering the world's first antibiotic, or bacteria killer," Fleming would later say, "But I suppose that was exactly what I did."[11]

By 1927, Fleming had been investigating the properties of staphylococci. He was already well-known from his earlier work, and had developed a reputation as a brilliant researcher, but his laboratory was often untidy. On 3 September 1928, Fleming returned to his laboratory having spent August on holiday with his family. Before leaving, he had stacked all his cultures of staphylococci on a bench in a corner of his laboratory. On returning, Fleming noticed that one culture was contaminated with a fungus, and that the colonies of staphylococci immediately surrounding the fungus had been destroyed, whereas other staphylococci colonies farther away were normal, famously remarking "That's funny".[12] Fleming showed the contaminated culture to his former assistant Merlin Price, who reminded him, "That's how you discovered lysozyme."[13] Fleming grew the mould in a pure culture and found that it produced a substance that killed a number of disease-causing bacteria. He identified the mould as being from the Penicillium genus, and, after some months of calling it "mould juice", named the substance it released penicillin on 7 March 1929.[14] The laboratory in which Fleming discovered and tested penicillin is preserved as the Alexander Fleming Laboratory Museum in St. Mary's Hospital, Paddington.

He investigated its positive anti-bacterial effect on many organisms, and noticed that it affected bacteria such as staphylococci and many other Gram-positive pathogens that cause scarlet fever, pneumonia, meningitis and diphtheria, but not typhoid fever or paratyphoid fever, which are caused by Gram-negative bacteria, for which he was seeking a cure at the time. It also affected Neisseria gonorrhoeae, which causes gonorrhoea although this bacterium is Gram-negative.

Fleming published his discovery in 1929, in the British Journal of Experimental Pathology,[15] but little attention was paid to his article. Fleming continued his investigations, but found that cultivating penicillium was quite difficult, and that after having grown the mould, it was even more difficult to isolate the antibiotic agent. Fleming's impression was that because of the problem of producing it in quantity, and because its action appeared to be rather slow, penicillin would not be important in treating infection. Fleming also became convinced that penicillin would not last long enough in the human body (in vivo) to kill bacteria effectively. Many clinical tests were inconclusive, probably because it had been used as a surface antiseptic. In the 1930s, Fleming’s trials occasionally showed more promise,[16] and he continued, until 1940, to try to interest a chemist skilled enough to further refine usable penicillin. Fleming finally abandoned penicillin, and not long after he did, Howard Florey and Ernst Boris Chain at the Radcliffe Infirmary in Oxford took up researching and mass-producing it, with funds from the U.S. and British governments. They started mass production after the bombing of Pearl Harbor. By D-Day in 1944, enough penicillin had been produced to treat all the wounded with the Allied forces.

Purification and stabilisation[edit]

3D-model of benzylpenicillin.

In Oxford, Ernst Boris Chain and Edward Abraham discovered how to isolate and concentrate penicillin. Abraham was the first to propose the correct structure of penicillin.[17][18] Shortly after the team published its first results in 1940, Fleming telephoned Howard Florey, Chain's head of department, to say that he would be visiting within the next few days. When Chain heard that Fleming was coming, he remarked "Good God! I thought he was dead."

Norman Heatley suggested transferring the active ingredient of penicillin back into water by changing its acidity. This produced enough of the drug to begin testing on animals. There were many more people involved in the Oxford team, and at one point the entire Dunn School was involved in its production.

After the team had developed a method of purifying penicillin to an effective first stable form in 1940, several clinical trials ensued, and their amazing success inspired the team to develop methods for mass production and mass distribution in 1945.

Fleming was modest about his part in the development of penicillin, describing his fame as the "Fleming Myth" and he praised Florey and Chain for transforming the laboratory curiosity into a practical drug. Fleming was the first to discover the properties of the active substance, giving him the privilege of naming it: penicillin. He also kept, grew, and distributed the original mould for twelve years, and continued until 1940 to try to get help from any chemist who had enough skill to make penicillin. But Sir Henry Harris said in 1998: "Without Fleming, no Chain; without Chain, no Florey; without Florey, no Heatley; without Heatley, no penicillin."[19]


Modern antibiotics are tested using a method similar to Fleming's discovery.

Fleming's accidental discovery and isolation of penicillin in September 1928 marks the start of modern antibiotics. Before that, several scientists had published or pointed out that mould or penicillium sp. were able to inhibit bacterial growth, and even to cure bacterial infections in animals. Ernest Duchesne in 1897 in his thesis "Contribution to the study of vital competition in micro-organisms: antagonism between moulds and microbes",[20] or also Clodomiro Picado Twight whose work at Institut Pasteur in 1923 on the inhibiting action of fungi of the "Penicillin sp" genre in the growth of staphylococci drew little interest from the direction of the Institut at the time. Fleming was the first to push these studies further by isolating the penicillin, and by being motivated enough to promote his discovery at a larger scale. Fleming also discovered very early that bacteria developed antibiotic resistance whenever too little penicillin was used or when it was used for too short a period. Almroth Wright had predicted antibiotic resistance even before it was noticed during experiments. Fleming cautioned about the use of penicillin in his many speeches around the world. He cautioned not to use penicillin unless there was a properly diagnosed reason for it to be used, and that if it were used, never to use too little, or for too short a period, since these are the circumstances under which bacterial resistance to antibiotics develops.


The popular story[21] of Winston Churchill's father paying for Fleming's education after Fleming's father saved young Winston from death is false. According to the biography, Penicillin Man: Alexander Fleming and the Antibiotic Revolution by Kevin Brown, Alexander Fleming, in a letter[22] to his friend and colleague Andre Gratia,[23] described this as "A wondrous fable." Nor did he save Winston Churchill himself during World War II. Churchill was saved by Lord Moran, using sulphonamides, since he had no experience with penicillin, when Churchill fell ill in Carthage in Tunisia in 1943. The Daily Telegraph and The Morning Post on 21 December 1943 wrote that he had been saved by penicillin. He was saved by the new sulphonamide drug Sulphapyridine, known at the time under the research code M&B 693, discovered and produced by May & Baker Ltd, Dagenham, Essex – a subsidiary of the French group Rhône-Poulenc. In a subsequent radio broadcast, Churchill referred to the new drug as "This admirable M&B".[24] It is highly probable that the correct information about the sulphonamide did not reach the newspapers because, since the original sulphonamide antibacterial, Prontosil, had been a discovery by the German laboratory Bayer, and as Britain was at war with Germany at the time, it was thought better to raise British morale by associating Churchill's cure with a British discovery, penicillin.

Awards and honours[edit]

Display of Fleming's awards, including his Nobel Prize. Also shows a sample of penicillin and an example of an early apparatus for preparing penicillin.
Fleming (centre) receiving the Nobel prize from King Gustaf V of Sweden (right) in 1945
Faroe Islands stamp commemorating Fleming

His discovery of penicillin had changed the world of modern medicine by introducing the age of useful antibiotics; penicillin has saved, and is still saving, millions of people around the world.[25]

The laboratory at St Mary's Hospital where Fleming discovered penicillin is home to the Fleming Museum, a popular London attraction. His alma mater, St Mary's Hospital Medical School, merged with Imperial College London in 1988. The Sir Alexander Fleming Building on the South Kensington campus was opened in 1998, where his son Robert and his great grand-daughter Claire were presented to the Queen and is now one of the main preclinical teaching sites of the Imperial College School of Medicine.

His other alma mater, the Royal Polytechnic Institution (now the University of Westminster) has named one of its student halls of residence Alexander Fleming House, which is near to Old Street.

It was a discovery that would change the course of history. The active ingredient in that mould, which Fleming named penicillin, turned out to be an infection-fighting agent of enormous potency. When it was finally recognized for what it was, the most efficacious life-saving drug in the world, penicillin would alter forever the treatment of bacterial infections. By the middle of the century, Fleming's discovery had spawned a huge pharmaceutical industry, churning out synthetic penicillins that would conquer some of mankind's most ancient scourges, including syphilis, gangrene and tuberculosis.[28]

  • When 2000 was approaching, at least three large Swedish magazines ranked penicillin as the most important discovery of the millennium.
  • In 2002, Fleming was named in the BBC's list of the 100 Greatest Britons following a nationwide vote.[29]
  • A statue of Alexander Fleming stands outside the main bullring in Madrid, Plaza de Toros de Las Ventas.[30] It was erected by subscription from grateful matadors, as penicillin greatly reduced the number of deaths in the bullring.[30]
  • Flemingovo náměstí is a square named after Fleming in the university area of the Dejvice community in Prague.
  • A secondary school is named after him in Sofia, Bulgaria.
  • In mid-2009, Fleming was commemorated on a new series of banknotes issued by the Clydesdale Bank; his image appears on the new issue of £5 notes.[31]
  • 91006 Fleming, an asteroid in the Asteroid Belt, is named after Fleming.

Personal life[edit]

On 24 December 1915, Fleming married a trained nurse, Sarah Marion McElroy of Killala, County Mayo, Ireland. Their only child, Robert Fleming, (b. 1924 died 2 July 2015) became a general medical practitioner; Robert married Kathleen a trained radiographer on 10 September 1955 and had two children Andrew (b. 1956) and Sarah (b. 1959). He has two great grand-sons (James and Christopher) and one great grand-daughter (Claire). After Sarah's death in 1949, Fleming married Dr. Amalia Koutsouri-Vourekas, a Greek colleague at St. Mary's, on 9 April 1953; she died in 1986.[citation needed]


On 11 March 1955, Fleming died at his home in London of a heart attack. He was buried in St Paul's Cathedral.[32]


  1. ^ Jump up to: a b c Colebrook, L. (1956). "Alexander Fleming 1881-1955". Biographical Memoirs of Fellows of the Royal Society 2: 117–126. doi:10.1098/rsbm.1956.0008. JSTOR 769479. 
  2. ^ Jump up to: a b c "Alexander Fleming Biography". Les Prix Nobel. The Nobel Foundation. 1945. Retrieved 27 March 2011. 
  3. Jump up ^ McIntyre N (2007). "Sir Alexander Fleming". Journal of medical biography 15 (4): 234. doi:10.1258/j.jmb.2007.05-72. PMID 18615899. 
  4. Jump up ^ Hugh TB (2002). "Howard Florey, Alexander Fleming and the fairy tale of penicillin". The Medical journal of Australia 177 (1): 52–53; author 53 53. PMID 12436980. 
  5. Jump up ^ Raju TN (1999). "The Nobel chronicles. 1945: Sir Alexander Fleming (1881-1955); Sir Ernst Boris Chain (1906-79); and Baron Howard Walter Florey (1898-1968)". Lancet 353 (9156): 936. doi:10.1016/S0140-6736(05)75055-8. PMID 10094026. 
  6. Jump up ^ Mazumdar PM (1984). "Fleming as Bacteriologist: Alexander Fleming". Science 225 (4667): 1140–1141. doi:10.1126/science.225.4667.1140. PMID 17782415. 
  7. Jump up ^ Robert Cruickshank (1955). "Sir Alexander Fleming, F.R.S". Nature 175 (4459): 663. doi:10.1038/175663a0. 
  8. Jump up ^ Brown, Kevin (2004). Penicillin man : Alexander Fleming and the antibiotic revolution. Stroud: Sutton. ISBN 978-0750931526. Retrieved 11 September 2015. 
  9. Jump up ^
  10. Jump up ^ Fleming A (1922). "On a remarkable bacteriolytic element found in tissues and secretions". Proceedings of the Royal Society B 93 (653): 306–317. doi:10.1098/rspb.1922.0023. 
  11. Jump up ^ Haven, Kendall F. (1994). Marvels of Science : 50 Fascinating 5-Minute Reads. Littleton, Colo: Libraries Unlimited. p. 182. ISBN 1-56308-159-8. 
  12. Jump up ^ Brown, K. (2004). Penicillin Man: Alexander Fleming and the Antibiotic Revolution. 320 pp. Sutton Publishing. ISBN 0-7509-3152-3.
  13. Jump up ^ Hare, R. The Birth of Penicillin, Allen & Unwin, London, 1970
  14. Jump up ^ Diggins, F. The true history of the discovery of penicillin by Alexander Fleming Biomedical Scientist, March 2003, Insititute of Biomedical Sciences, London. (Originally published in the Imperial College School of Medicine Gazette)
  15. Jump up ^ Fleming A (1980). "On the antibacterial action of cultures of a penicillium, with special reference to their use in the isolation of B. influenzae. (Reprinted from the British Journal of Experimental Pathology 10:226-236, 1929)". Clin Infect Dis. 2 (1): 129–39. doi:10.1093/clinids/2.1.129. PMID 6994200. 
  16. Jump up ^ Rossiter, Peter (10 September 2010). "Keith Bernard Rogers". BMJ. Retrieved 4 March 2012. Keith was probably the first patient to be treated clinically with penicillin ointment. 
  17. Jump up ^ in October 1943 Abraham proposed a molecular structure which included a cyclic formation containing three carbon atoms and one nitrogen atom, the β-lactam ring, not then known in natural products. This structure was not immediately published due to the restrictions of wartime secrecy, and was initially strongly disputed, by Sir Robert Robinson among others, but it was finally confirmed in 1945 by Dorothy Crowfoot Hodgkin using X-ray analysis." Oxford Dictionary of National Biography; "Abraham, Sir Edward Penley"
  18. Jump up ^ Lowe, Gordon (13 May 1999). "Obituary: Sir Edward Abraham". The Independent (London). 
  19. Jump up ^ Henry Harris, Howard Florey and the development of penicillin, a lecture given on 29 September 1998, at the Florey Centenary, 1898–1998, Sir William Dunn School of Pathology, Oxford University (sound recording) [1]
  20. Jump up ^ Duchesne 1897, Antagonism between molds and bacteria. An English translation by Michael Witty. Fort Myers, 2013. ASIN B00E0KRZ0E and B00DZVXPIK.
  21. Jump up ^ e.g., Philadelphia Enquirer, 17 July 1945: Brown, Penicillin Man, note 43 to Chapter 2
  22. Jump up ^ 14 November 1945; British Library Additional Manuscripts 56115: Brown, Penicillin Man, note 44 to Chapter 2
  23. Jump up ^ see Wikipedia Discovery of penicillin article entry for 1920
  24. Jump up ^ A History of May & Baker 1834–1984, Alden Press 1984.
  25. Jump up ^ Roberts, Michael; Neil Ingram (2001). Biology (2, illustrated ed.). Nelson Thornes. p. 105. ISBN 0-7487-6238-8. Retrieved 4 March 2012. Penicillin is just one of a very large number of drugs which today are used by doctors to treat people with diseases. 
  26. Jump up ^ "100,000 visitors in 6 days". National Museums Scotland. 3 August 2011. Retrieved 4 March 2012. 
  27. Jump up ^ "People of the century". P. 78. CBS News. Simon & Schuster, 1999
  28. Jump up ^ "Alexander Fleming – Time 100 People of the Century". Time. 29 March 1999. 
  29. Jump up ^ "100 great Britons - A complete list". Daily Mail. Retrieved 3 August 2012. 
  30. ^ Jump up to: a b Edward Lewine (2007). "Death and the Sun: A Matador's Season in the Heart of Spain". p. 123. Houghton Mifflin Harcourt, 2007
  31. Jump up ^ "Banknote designs mark Homecoming". BBC News. 14 January 2008. Archived from the original on 25 January 2009. Retrieved 20 January 2009. 
  32. Jump up ^ "Sir Alexander Fleming – Biography". Retrieved 25 October 2011. 

Further reading[edit]

  • The Life Of Sir Alexander Fleming, Jonathan Cape, 1959. Maurois, André.
  • Nobel Lectures,the Physiology or Medicine 1942–1962, Elsevier Publishing Company, Amsterdam, 1964
  • An Outline History of Medicine. London: Butterworths, 1985. Rhodes, Philip.
  • The Cambridge Illustrated History of Medicine. Cambridge, England: Cambridge University Press, 1996. Porter, Roy, ed.
  • Penicillin Man: Alexander Fleming and the Antibiotic Revolution, Stroud, Sutton, 2004. Brown, Kevin.
  • Alexander Fleming: The Man and the Myth, Oxford University Press, Oxford, 1984. Macfarlane, Gwyn
  • Fleming, Discoverer of Penicillin, Ludovici, Laurence J., 1952

External links[edit]

Media related to Alexander Fleming at Wikimedia Commons

Academic offices
Preceded by
Alastair Sim
Rector of the University of Edinburgh
Succeeded by
Sydney Smith