42 Entries

Thucydides observed that survivors of the plague did not get sick again, one of the earliest recorded observations of acquired immunity.

Chinese practitioners used dried smallpox scabs blown into the nose; Indian practitioners used material from pustules. Earliest documented attempts at deliberate immunization.

Chinese physician Wan Quan published the earliest known written description of variolation techniques.

Lady Montagu, wife of the British ambassador, wrote letters describing the Turkish practice of variolation. She had her son inoculated in Constantinople before introducing the practice to England.

During a smallpox epidemic, minister Cotton Mather (informed by his enslaved man Onesimus about African inoculation practices) persuaded Dr. Boylston to inoculate Bostonians. A bomb was thrown through Mather's window in protest.

After observing variolation in Ottoman Turkey, Lady Montagu had her children inoculated and promoted the practice in England.

Eight-year-old Jenner underwent the brutal variolation procedure (starved, bled, purged, then inoculated with smallpox). His difficult experience may have motivated his later search for a safer method.

Farmer Benjamin Jesty inoculated his family with cowpox to protect against smallpox, predating Jenner by 22 years.

Jenner inoculated 8-year-old James Phipps with cowpox material, then demonstrated immunity to smallpox. Published 1798. Considered the birth of vaccination.

Arm-to-arm vaccination transmitted syphilis, erysipelas, TB, tetanus.

Vaccine material shipped worldwide. Waterhouse introduced it to the Americas. Spanish Balmis Expedition (1803-06) carried vaccine across the Spanish Empire.

Satirist James Gillray published a famous cartoon depicting vaccinated people sprouting cow parts, reflecting early public fears about Jenner's cowpox-based vaccine. Became an iconic image of anti-vaccination sentiment.

Spain launched a global vaccination expedition using arm-to-arm transfer through 22 orphan boys to carry live cowpox vaccine across the Atlantic to Spanish colonies in the Americas and the Philippines.

President Jefferson wrote to Edward Jenner expressing hope that vaccination would finally extirpate smallpox. Jefferson personally promoted vaccination and had members of his household inoculated.

Congress passed An Act to Encourage Vaccination, authorizing the President to appoint an agent to preserve and distribute smallpox vaccine to citizens, the first federal vaccine legislation.

Banned variolation and provided free smallpox vaccination for the poor. First government intervention in vaccination policy.

First compulsory vaccination law. Required infant smallpox vaccination. Sparked organized anti-vaccination movement.

Extended vaccination provisions and established local boards of health with authority over vaccination administration, strengthening the public health infrastructure.

Massachusetts became the first U.S. state to require smallpox vaccination for children enrolled in public schools. By the early 1900s, several states had adopted similar policies.

Founded in response to the 1853 and 1867 UK Vaccination Acts imposing fines and imprisonment for non-compliance. Published the National Anti-Compulsory Vaccination Reporter.

Strengthened 1853 Act with penalties for non-compliance. Fueled anti-vaccination leagues.

Pasteur's experiments confirming the germ theory of disease laid the foundation for all subsequent vaccine development. His work on chicken cholera, anthrax, and rabies vaccines established the principles of attenuation and immunization.

Anti-vaccination sentiment caused Stockholm vaccination rates to fall below 40%, while the rest of Sweden maintained about 90%. A major 1874 epidemic reversed public opinion.

Koch developed revolutionary methods for growing and staining bacteria, establishing the techniques that would enable identification of pathogens targeted by future vaccines.

Founded after a visit by British anti-vaccinationist William Tebb. Adopted advocacy for alternative remedies and legal challenges to mandates.

Pasteur accidentally discovered that aged (attenuated) cultures of chicken cholera bacteria could protect chickens from virulent infection. Foundation of live attenuated vaccines.

Pasteur conducted a dramatic public demonstration of anthrax vaccination at a farm in Pouilly-le-Fort. All vaccinated sheep survived anthrax challenge while unvaccinated controls died, proving the concept of protective vaccination.

Pasteur publicly demonstrated anthrax vaccine efficacy at Pouilly-le-Fort. Major triumph for germ theory.

Koch identified Mycobacterium tuberculosis as the cause of TB. Later awarded Nobel Prize (1905).

Regional anti-vaccination organization that used pamphlets, court battles, and legislative campaigns. Successfully repealed compulsory vaccination laws in several states.

First vaccine against cholera, tested in Valencia during an epidemic.

Up to 100,000 people marched in Leicester against compulsory vaccination. Led to appointment of a Royal Commission to investigate anti-vaccination grievances.

Pasteur successfully vaccinated 9-year-old Joseph Meister after rabies exposure. First post-exposure prophylaxis.

The Pasteur Institute was established in Paris to continue Pasteur's research on rabies and other diseases. Became one of the world's leading centers for vaccine research and production.

Development of serum therapy for tetanus and diphtheria. Von Behring received first Nobel Prize in Medicine (1901).

Von Behring and Kitasato demonstrated that serum from immunized animals could protect against diphtheria and tetanus, establishing the principle of passive immunization (antitoxin therapy).

Koch announced tuberculin as cure for TB. Caused severe reactions and deaths. Repurposed as diagnostic tool.

Diphtheria antitoxin entered widespread clinical use, dramatically reducing mortality from 40-50% to under 10%. Mass production began at the New York City Health Department and Pasteur Institute.

Heat-killed typhoid vaccine developed independently by Wright (UK) and Pfeiffer/Kolle (Germany).

Haffkine developed and tested plague vaccine in India during epidemic.

New UK Vaccination Act introduced a conscientious objector clause allowing parents to opt out of mandatory smallpox vaccination, the first use of this concept in law.