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Medical Breakthroughs — The Big Steps That Saved Lives

The big steps that saved lives — from cowpox lymph in a country doctor's hand to messenger RNA folded by an algorithm. Two centuries of pushing back against...

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The big steps that saved lives — from cowpox lymph in a country doctor's hand to messenger RNA folded by an algorithm. Two centuries of pushing back against death. Key sections include: MEDICAL BREAK- THROUGHS; Jenner inoculates a boy with cowpox.; Morton ends the screaming centuries.; Two men kill the invisible killers.; Röntgen finds the "X" rays.; Fleming returns from holiday to a mouldy miracle.; A double helix on a scrap of paper.; Salk's vaccine ends the summer terror.; Barnard transplants a beating heart.; Louise Brown — the world's first IVF baby..

Key sections

01MEDICAL BREAK- THROUGHS
02Jenner inoculates a boy with cowpox.
03Morton ends the screaming centuries.
04Two men kill the invisible killers.
05Röntgen finds the "X" rays.
06Fleming returns from holiday to a mouldy miracle.
07A double helix on a scrap of paper.
08Salk's vaccine ends the summer terror.
09Barnard transplants a beating heart.
10Louise Brown — the world's first IVF baby.
11Antiretrovirals turn HIV treatable.
12mRNA vaccines, designed in a weekend.
13Two centuries, one direction.

Topics covered

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Slide outline

01MEDICAL BREAK- THROUGHS
02Jenner inoculates a boy with cowpox.
03Morton ends the screaming centuries.
04Two men kill the invisible killers.
05Röntgen finds the "X" rays.
06Fleming returns from holiday to a mouldy miracle.
07A double helix on a scrap of paper.
08Salk's vaccine ends the summer terror.
09Barnard transplants a beating heart.
10Louise Brown — the world's first IVF baby.
11Antiretrovirals turn HIV treatable.
12mRNA vaccines, designed in a weekend.
13Two centuries, one direction.

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Presentation Transcript

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Slide 01

MEDICAL BREAK- THROUGHS

A History in 13 Steps
The big steps that saved lives — from cowpox lymph in a country doctor's hand to messenger RNA folded by an algorithm. Two centuries of pushing back against death.
13 Slides1796 → 2021
Era Spanned225 years
Lives SavedHundreds of millions

Slide 02

Jenner inoculates a boy with cowpox.

02 / 13 — The First Vaccine
A country physician notices milkmaids don't catch smallpox. He tests a hunch on 8-year-old James Phipps — and invents immunology.
17·96
Edward Jenner — Berkeley, England
Smallpox vaccination — the first deliberate immunisation
Jenner inoculated a boy with material from a cowpox lesion, then exposed him to smallpox. The boy didn't get sick. The Latin word for cow, vacca, gave the procedure its name. Smallpox would go on to be the only human disease ever eradicated (1980).
300M+
Smallpox deaths in the
20th century alone
Cases since 1977
(the disease is gone)
A drop, an arm, an ideaImmunology begins

Slide 03

Morton ends the screaming centuries.

03 / 13 — Painless Surgery
Until October 1846, surgery meant being held down, awake, while a surgeon worked as fast as humanly possible.
18·46
William T. G. Morton — Massachusetts General Hospital
Ether anesthesia: the first public demonstration in the "Ether Dome"
Morton inhaled diethyl ether through a glass apparatus to a 20-year-old patient named Edward Abbott. Surgeon John Collins Warren removed a neck tumor in silence. Warren turned to the audience and said, "Gentlemen, this is no humbug." Within a year ether crossed the Atlantic.
21 Oct
1846 — "Ether Day"
at MGH, Boston
100%
Of modern surgery
built on this moment
From horror to silenceEther Day

Slide 04

Two men kill the invisible killers.

04 / 13 — Why Patients Died After Surgery
Surgery was now painless — but post-operative infection killed roughly half of all surgical patients. Then a chemist in Paris and a surgeon in Glasgow connected the dots.
1861
Louis Pasteur — Paris
Germ Theory of Disease
Pasteur's swan-neck flask experiments showed microorganisms cause spoilage and disease — not "spontaneous generation" or bad air. He invented pasteurisation along the way and later developed vaccines for rabies and anthrax.
1867
Joseph Lister — Glasgow Royal
Antiseptic Surgery
Reading Pasteur, Lister sprayed carbolic acid in operating theatres and washed instruments. Surgical mortality at his hospital plunged. The mouthwash bearing his name (Listerine) is the small commercial echo.
50% → 15%
Surgical mortality drop after carbolic acid spray
1864
Year pasteurisation patented
Implications: hand-washing, hygiene, modern microbiology

Slide 05

Röntgen finds the "X" rays.

05 / 13 — Seeing Through Skin
Working in a darkened lab, the German physicist saw a barium-coated screen glow even with his cathode-ray tube covered. He had stumbled into the first medical imaging.
18·95
Wilhelm Conrad Röntgen — Würzburg, Germany
X-ray imaging — first non-invasive look inside the living body
On 8 November 1895 Röntgen photographed his wife Anna's hand: bones and wedding ring sharply visible through flesh. She reportedly gasped, "I have seen my death." Within weeks the technique was being used in clinics. The first Nobel Prize in Physics (1901) went to him.
15 min
Exposure for that
first hand image
3.6B
X-ray exams now
performed yearly
Bones through skinThe first medical scan

Slide 06

Fleming returns from holiday to a mouldy miracle.

06 / 13 — A Forgotten Petri Dish
A blue-green mould had killed the bacteria around it. Fleming named the substance penicillin. It would take Florey, Chain and a wartime crisis to mass-produce it.
19·28
Alexander Fleming → Florey & Chain (Oxford, 1940)
Penicillin — the antibiotic age begins
Fleming's accident sat in a journal for a decade. Then Howard Florey and Ernst Chain at Oxford figured out purification; American pharma scaled production for D-Day. Soldiers who would have died from infected wounds in WWI now survived. The trio shared the 1945 Nobel.
200M+
Lives saved by
penicillin alone
2.3M doses
Produced for Allied
troops by D-Day, 1944
A clear ring of dead bacteriaThe first antibiotic

Slide 07

A double helix on a scrap of paper.

07 / 13 — The Secret of Life
In Cambridge, Watson and Crick built models. In London, Rosalind Franklin's X-ray diffraction "Photo 51" handed them the answer.
19·53
Watson, Crick, Franklin & Wilkins — Cambridge / King's College London
Structure of DNA: two anti-parallel strands, base pairs A-T and G-C
A one-page paper in Nature proposed a self-copying molecule. It birthed molecular biology, recombinant DNA, the Human Genome Project, CRISPR — and eventually the mRNA vaccines on slide 12. Franklin's contribution was for decades under-credited.
3.2B
Base pairs in the
human genome
2003
Year the genome was
fully sequenced
Two strands, four lettersThe code of life

Slide 08

Salk's vaccine ends the summer terror.

08 / 13 — Iron Lungs Empty Out
Mid-century parents feared polio more than any other disease. Pools closed. Children appeared in newsreels in iron lungs. Then a Pittsburgh lab made a vaccine.
19·54
Jonas Salk → Albert Sabin (oral version, 1961)
Inactivated polio vaccine — first mass childhood immunisation campaign in the US
Salk's 1954 trial was the largest medical experiment in history: 1.8 million "Polio Pioneers." Asked who owned the patent, Salk replied: "There is no patent. Could you patent the sun?" Wild polio is now confined to two countries.
99.9%
Reduction in wild
polio cases since 1988
Salk's earnings
from the patent
From 350,000 cases (1988)To a few dozen today

Slide 09

Barnard transplants a beating heart.

09 / 13 — A Heart Borrowed
A 9-hour operation in Cape Town moved the heart of a young woman killed in a car crash into the chest of a 53-year-old grocer.
19·67
Christiaan Barnard — Groote Schuur Hospital, Cape Town
First successful human-to-human heart transplant
Patient Louis Washkansky lived 18 days; he died of pneumonia, not rejection. The world's press camped outside the hospital. Within years, surgeons everywhere were transplanting hearts, kidneys, livers and lungs. Cyclosporine (1983) made long-term survival routine.
3 Dec 1967
Date of the first
heart transplant
~150,000
Solid-organ transplants
now done globally each year
A new beatThe transplant era

Slide 10

Louise Brown — the world's first IVF baby.

10 / 13 — Conception, Re-engineered
Born 25 July 1978 in Oldham, England, weighing 5 lb 12 oz. The egg had been fertilised in a glass dish in a Cambridge lab.
19·78
Robert Edwards & Patrick Steptoe — UK
In-vitro fertilisation: the start of assisted reproduction
Edwards spent two decades being denied research funding. The Catholic Church condemned the experiment. The headlines screamed "test-tube baby." Today IVF is mundane medicine. Edwards received the Nobel Prize in 2010 — Steptoe had died, ineligible posthumously.
12M+
People born via IVF
since Louise Brown
1 in 60
Babies in developed
countries (and rising)
A glass dish, a new familyReproductive medicine

Slide 11

Antiretrovirals turn HIV treatable.

11 / 13 — Death Sentence to Chronic Condition
In the early '80s, a positive HIV test meant a death within years. By the mid-'90s a triple-drug cocktail rewrote the obituary pages.
1987→1996
AZT (1987) → HAART triple therapy (1996)
Highly Active Antiretroviral Therapy: HIV becomes a chronic disease
David Ho's combination therapy reduced HIV in the blood to undetectable levels. Within a couple of years US AIDS deaths halved. Today a person with HIV on treatment has near-normal life expectancy and cannot transmit the virus (U=U).
21M+
Lives saved by
antiretroviral therapy
U = U
Undetectable equals
untransmittable
Three drugs, one daily pillHIV becomes chronic

Slide 12

mRNA vaccines, designed in a weekend.

12 / 13 — From Sequence to Shoulder in 11 Months
SARS-CoV-2's genome was published 11 January 2020. Moderna's vaccine sequence was finalised 48 hours later. The first US arms were jabbed on 14 December 2020.
20·20-21
Karikó & Weissman (decades of mRNA work) → Pfizer/BioNTech, Moderna
First widely-deployed mRNA vaccines — and a new platform for medicine
Katalin Karikó and Drew Weissman spent the 1990s and 2000s figuring out how to get synthetic mRNA past the immune system. Their 2005 paper was the seed. In a pandemic year that work paid off — and won them the 2023 Nobel Prize. The platform is now being aimed at flu, RSV, cancer.
~14M
Lives saved by COVID
vaccines in year one
11 mo
From genome publication
to first authorised shot
A line of code, a vaccineThe platform era

Slide 13

Two centuries, one direction.

13 / 13 — Where to Go Next
Each breakthrough multiplied lifespan and shrank suffering. Global life expectancy in 1800: about 30. In 2024: about 73. The line keeps climbing.
Medicine is the only profession that labours incessantly to destroy the reason for its own existence.
— JAMES BRYCE
Further Reading
Siddhartha Mukherjee — The Emperor of All Maladies (2010); The Gene (2016)
Roy Porter — The Greatest Benefit to Mankind: A Medical History (1997)
Lindsey Fitzharris — The Butchering Art (Lister, 2017)
David Quammen — The Tangled Tree (molecular biology, 2018)
WHO & CDC reports on smallpox & polio eradication
Walter Isaacson — The Code Breaker (Doudna & CRISPR, 2021)
Watch on YouTube
Medical Breakthroughs in History
youtube.com — search results
Penicillin Discovery — Fleming
youtube.com — search results

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