Jenner, Vaccination and the Limits of 18th-Century Prevention
A Disease That Disfigured a Generation
In 18th-century Britain, smallpox killed roughly one in five of those who caught it and disfigured many of the survivors with deep pock-marks. Almost everyone caught it; the question was whether you survived. Queen Mary II died of it in 1694; George III’s four-year-old son Octavius died in 1783, days after being inoculated against it. Smallpox was the disease everyone feared most. The question of how to prevent it dominated 18th-century public health, and the answer that emerged from Gloucestershire would change global medicine.
In 1796 Edward Jenner inoculated 8-year-old James Phipps with cowpox material taken from a dairymaid’s hand. He then exposed Phipps to smallpox; the boy did not catch it. Jenner published his findings as the Inquiry in 1798, calling the new technique ‘vaccination’ from the Latin vacca, meaning cow.
Inoculation: The Existing Defence
Inoculation — also called variolation — was already in use in Britain before Jenner. The practice came from the Middle East and was popularised in England by Lady Mary Wortley Montagu, wife of the British ambassador to Constantinople, around 1721. She had her own children inoculated and persuaded Princess Caroline of Wales to inoculate her daughters. The technique involved deliberately giving someone a small amount of smallpox pus, usually rubbed into a scratch on the arm. Most patients caught only a mild dose and were then immune. But about 1 in 50 died, and inoculated patients could spread full smallpox to others. It was risky, expensive (around £5 per child — a labourer’s monthly wage), and only available to those who could pay.
Jenner’s Gloucestershire Observation
Edward Jenner, born 1749, trained under John Hunter in London before returning to practise in Berkeley, Gloucestershire. Local lore said that milkmaids did not catch smallpox — they caught a mild disease called cowpox from cows’ udders, but never the deadly version. Jenner was not the first to notice this; a Dorset farmer, Benjamin Jesty, had inoculated his family with cowpox in 1774. But Jenner was the first to test the idea systematically, record the experiment, and publish.
In May 1796 Jenner took pus from a cowpox sore on the hand of a milkmaid named Sarah Nelmes and used it to inoculate James Phipps, the 8-year-old son of his gardener. Phipps developed a mild fever and recovered. Six weeks later Jenner exposed Phipps to smallpox — an experiment that would now be unthinkable on ethical grounds. Phipps did not catch it. Jenner went on to test further cases, and his 1798 Inquiry set out 23 case histories in all, including his own 11-month-old son.
Three reasons. First, vaccination was much safer — cowpox very rarely killed anyone, while inoculation killed about 1 in 50. Second, vaccinated patients could not spread smallpox, so there was no risk of starting an epidemic. Third, it was much cheaper to produce. The downside was that Jenner could not explain why it worked. He had no theory of immunity, no germ theory, no microscope-level understanding. The mechanism would not be understood until Pasteur’s germ theory in the 1860s.
This empirical, theory-free quality made vaccination both incredibly powerful (it worked) and intensely vulnerable to opposition (Jenner could not say why).
Opposition to Vaccination
Opposition came from three directions. First, the inoculators — doctors who made their living from variolation — saw their business disappear and lobbied against vaccination. Second, the clergy: some ministers preached that injecting ‘beast matter’ into a human was unnatural and against God’s plan. The cartoonist James Gillray captured this fear in his 1802 print ‘The Cow-Pock’, showing patients sprouting cows’ heads from their bodies after vaccination. Third, ordinary people who feared something new and had nothing they could afford to risk. The 1853 Vaccination Act made vaccination compulsory for infants, sparking riots in towns including Leicester. The 1898 Vaccination Act introduced a ‘conscience clause’ allowing parents to refuse on grounds of belief.
Government Steps In
Vaccination is the first major medical intervention where the British government takes a serious financial and legal role. Parliament awarded Jenner a grant of £10,000 in 1802 and a further £20,000 in 1807 (huge sums in modern terms).
The Royal Jennerian Society was founded in 1803 to spread vaccination. By the 1820s, Britain ran the largest vaccination programme in the world. The 1853 Vaccination Act made it compulsory for all infants within three months of birth; the 1871 Act tightened enforcement by appointing local Vaccination Officers; smallpox in Britain dropped sharply across the 19th century. The 1898 Vaccination Act introduced the ‘conscience clause’ allowing parents to refuse on grounds of belief. This is the start of a long story in which government and public health become inseparable, leading directly to the 1848 Public Health Act, the 1875 Public Health Act and ultimately the NHS in 1948.
Vaccination was opposed by inoculators (commercial loss), clergy (‘beast matter’ into humans, satirised by Gillray 1802), and ordinary people fearing the unknown. Despite this, Parliament granted Jenner £30,000 in total. Smallpox was finally declared eradicated worldwide by the WHO in 1980.
Significance Over Time
Jenner’s work is significant in three ways worth bringing out. At the time: he saved the lives of thousands — smallpox deaths in Britain dropped from over 35,000 a year in the 1790s to a fraction of that by the 1850s. Across the next century: Pasteur (1880s) extended Jenner’s principle to other diseases, calling his weakened-pathogen technique ‘vaccination’ in honour of Jenner. Globally and over the very long term: vaccination programmes against polio, measles, mumps, rubella, hepatitis and many others trace directly back to Jenner’s 1796 experiment. The WHO declared smallpox eradicated in 1980 — the first and so far only human disease to be wiped out by medicine.
Linking to the Factor Essay
Jenner is a gift for the 16-mark essay because he involves so many factors at once. Chance: the cowpox-smallpox link was a Gloucestershire piece of folk knowledge nobody had systematically tested. The role of the individual: Jenner had the curiosity, training (Hunter’s scientific method), and willingness to experiment and publish. Government: enters health for the first time as a serious actor (Parliamentary grants, 1853 compulsion). Religion: as a brake, with clergy fuelling opposition. Science and technology: notable for its absence — Jenner had no theory, which is exactly why opposition could persist for decades.