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He is especially known for his exploration of tuberculosis.
During World War 2 he made the first Danish penicillin, independent of foreign countries

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In Denmark, the pathologist dr.med. Kai Adolf Jensen, who was a pioneer in the production of penicillin. Kai Adolf Jensen was in the period 1940-65 professor of general pathology at the University of Copenhagen.

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The use of penicillin, in nearly a generation, is also a historical example, that there may be negative side of human technical ability.
Several types of bacteria have namely developed resistance mechanisms to penicillin.

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Alexander Fleming`s discovery of penicillin had changed the world of modern medicine by introducing the age of useful antibiotics; penicillin has saved, and still saved millions of lives worldwide.

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In the 1930s showed Alexander`s results more promising, and he continued until the 1940th.
They  started the mass production of penicillin after the bombing of Pearl Harbor.
By D-Day in 1944, there was enough penicillin produced to treat all the wounded with the Allied forces.

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Alexander believed that due to the problem of producing it in large amounts, and because its action appeared to be rather slow, penicillin would not be important for the treatment of infection.
Alexander was also convinced that penicillin would not last long enough in the human body to kill bacteria effectively.

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Alexander believed that due to the problem of producing it in large amounts, and because its action appeared to be rather slow, penicillin would not be important for the treatment of infection.
Alexander was also convinced that penicillin would not last long enough in the human body to kill bacteria effectively.

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It also affected Neisseria gonorrhoeae that cause gonorrhea, although the bacterium is gram-negative, but not in bacteria such as typhoid and paratyphoid.
Alexander continued his studies, but found out that cultivating penicillium was quite difficult, and that after having developed the mold, it was even more difficult to isolate the antibiotic.

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He investigated its positive anti-bacterial effect on many organisms, and noticed that it affected bacteria such as staphylococci, scarlet fever, pneumonia, meningitis and diphtheria.

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Alexander grew a pure culture, and found out that it produced a fabric that killed a variety of pathogenic bacteria.
He identified the mold as being from the Penicillium -slægten.
On March 7, 1929 was the substance it released under the name penicillin.
The laboratory where Alexander discovered and tested penicillin is preserved as Alexander Fleming Laboratory Museum in St. Marys Hospital.

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When Alexander came back in the laboratory culture was contaminated with a fungus, and colonies of staphylococci had surrounded the fungus, so the staphylococci that were closest to the fungus had been destroyed, while other staphylococci colonies further away were normal.

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On September 3, 1928, Alexander has been on vacation and come back to his lab.
Before he left the lab, he had stacked all his cultures of staphylococci on a bench in a corner of his laboratory.

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In 1928, Alexander Professor of Bacteriology of the University of London.

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In 1927, Alexander was already known from his previous work with staphylococci, and had developed a reputation as a brilliant researcher.

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Although Alexander was able to achieve higher levels of lysozyme from egg white, the enzyme was only effective against small counts of harmful bacteria, and thus had little therapeutic potential.

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This is the first recorded discovery of lysozyme, an enzyme that is found in many secretions, including tears, saliva, skin, hair and nails, and mucous.

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At St Mary's Hospital examined Alexander Fleming antibacterial agents. He made experiments with groove from a patient with a heavy cold, and including the test he found that groove had an inhibitory effect on bacterial growth.

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In 1918 Alexander returned to St. Mary's Hospital.

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Alexander worked in the battlefield to a hospital on the Western Front in France during World War 1.

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Alexander was an associate professor at St. Merys until 1914th

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In 1908 Alexander lecturer at St. Mary's.

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In 1908, Alexander holds a BSc degree with a gold medal in Bacteriology.

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He became assistant bacteriologist to Sir Almroth Wright.
Sir Almroth Wright was a pioneer in vaccine therapy and immunology.

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In 1903, Alexander moved to London.
Alexander was connected to the research department at St Mary's.

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Twenty-year-old Alexander inherited some money from an uncle.

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Alexander had been a member of the rifle club at the medical school.

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As a boy came Alexander injured his nose so that he came to resemble one with 'boxer-nose'. The accident occurred a day when Alexander came running around a corner. Unfortunately, a small boy, Jackson, running in the opposite direction so that the two boys ran into each other.

Alexander got crushed cartilage in his nose that grew crooked.

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Alexander remarried in1952 with coworkers at St Mary's Hospital, Amalia Koutsouri-Vourekas.

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In 1949, Alexander`s wife Sarah McElroy dais.

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Alexander's son Robert was also a doctor, like his father.

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Alexander's son Robert was also a doctor, like his father.

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Alexander married on 1915 with Sarah McElroy

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Alexander went to Loudoun Moor School and Darvel School.

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Hugh Fleming died when Alexander was seven years.

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Alexander's mother was Grace Stirling Morton, who levede1848-1928.

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Alexander was from his father's second marriage.

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Alexander's father was a farmer, Hugh Fleming, who lived from 1816 to 1888.

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Alexander was the third of four children.

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Alexander is buried in St. Paul's Cathedral