Modern Medicine: The NHS & Antibiotics
The Discovery of Penicillin
The development of penicillin is one of the most important breakthroughs in the history of medicine. It transformed the treatment of infectious diseases and saved millions of lives. But its journey from accidental discovery to mass production took nearly two decades and required the work of three very different scientists.
Fleming’s Accidental Discovery (1928)
In September 1928, Alexander Fleming returned from holiday to his laboratory at St Mary’s Hospital in London. He noticed that a mould called Penicillium notatum had contaminated one of his petri dishes containing staphylococcus bacteria. Around the mould, the bacteria had been killed. Fleming realised the mould was producing a substance that destroyed bacteria — he called it penicillin.
Fleming published his findings in 1929, but he lacked the resources and the chemical expertise to purify penicillin or produce it in large quantities. His discovery was largely ignored for over a decade.
Fleming discovered penicillin by accident in 1928, but he could not develop it further. It took the work of Howard Florey and Ernst Chain, combined with massive American government funding during the Second World War, to turn penicillin into a life-saving medicine.
Florey & Chain: Mass Production
In 1938, Howard Florey and Ernst Chain at Oxford University revisited Fleming’s work. They successfully purified penicillin and tested it on mice, proving it could cure bacterial infections without harming the patient. Their first human trial in 1941 showed dramatic results, but they could not produce enough penicillin in Britain during wartime.
Florey travelled to the United States, where the US government invested heavily in mass production. American pharmaceutical companies developed new techniques to grow penicillin in large vats. By D-Day in June 1944, enough penicillin was available to treat all Allied wounded soldiers. The drug saved countless lives during the war and revolutionised post-war medicine.
Several factors explain the delay. Fleming was a bacteriologist, not a chemist — he lacked the skills to purify the drug. Funding for medical research in the 1930s was limited, especially during the Great Depression. It was only the urgent need to treat battlefield infections during the Second World War that provided the motivation and the funding for mass production. The role of war as a factor in driving medical progress is a key theme of this specification.
Magic Bullets & Antibiotics
Penicillin was not the first attempt to kill bacteria inside the body. In 1909, Paul Ehrlich developed magic bullets — chemical compounds designed to target specific germs. His drug Salvarsan 606 successfully treated syphilis. In the 1930s, Gerhard Domagk developed Prontosil, another magic bullet that treated blood poisoning.
However, antibiotics like penicillin were different — they were natural substances produced by moulds or fungi that could kill a wide range of bacteria. After penicillin, scientists developed many more antibiotics, making previously deadly infections treatable.
The Creation of the NHS (1948)
Before 1948, healthcare in Britain was not free. Patients had to pay for treatment, and many working-class families could not afford to see a doctor. Hospitals were a patchwork of voluntary and local authority institutions with no national coordination.
The National Health Service (NHS) was created in 1948 by Health Minister Aneurin Bevan. It provided free healthcare for everyone, funded through taxation. For the first time, every citizen could access a doctor, hospital treatment, and medicines without paying.
The NHS faced significant opposition. Many doctors, represented by the British Medical Association (BMA), opposed it because they feared losing their independence and income. Bevan overcame this resistance partly by allowing doctors to continue private practice alongside NHS work, famously saying he had “stuffed their mouths with gold.”
Some politicians also opposed the cost. However, the experience of the Second World War — during which the government had organised emergency healthcare and the Beveridge Report (1942) had called for a welfare state — created strong public support for free healthcare.
High-Tech Medical & Surgical Treatment
The 20th and 21st centuries have seen extraordinary advances in medical technology. Diagnostic technology such as X-rays, CT scans, MRI scans, and ultrasound allow doctors to see inside the body without surgery. Blood tests can detect diseases before symptoms appear.
Surgical treatment has been transformed by keyhole surgery, laser technology, and transplant surgery. Heart transplants, kidney dialysis, and joint replacements are now routine procedures. These advances depend on continued government funding, scientific research, and the infrastructure of the NHS.
Change and Continuity in Modern Medicine
The period c1900–present shows both dramatic change and some surprising continuity in medicine. The biggest changes include the shift from patients paying for care to the free NHS, the development of antibiotics that made previously fatal infections treatable, and the rise of high-tech diagnostic and surgical equipment. The role of government expanded enormously — from limited involvement at the start of the century to running the entire healthcare system by 1948.
However, continuity is also evident. The basic scientific method established by Pasteur and Koch in the 19th century — identifying specific causes of disease and developing targeted treatments — remains the foundation of modern medical research. Hospitals continue to be central to healthcare, even if their technology has transformed. And the challenge of making new treatments available to everyone, which motivated the creation of the NHS, remains a live issue as the cost of modern medicine continues to rise.