History, claims and evidence — in context.
A starting-point timeline for understanding how vaccination developed, where controversies arose, and how evidence changed over time. This archive is educational, not personal medical advice.
Smallpox: the first vaccine and eradication
Edward Jenner demonstrated vaccination against smallpox in 1796. Vaccination later became central to an international eradication programme, and WHO declared smallpox eradicated in 1980.
Polio: mass vaccination and changing vaccine technology
Jonas Salk’s inactivated vaccine was licensed in 1955; Albert Sabin’s oral vaccine followed. The history also illustrates why benefits and risks can change with vaccine type, disease prevalence and public-health context.
MMR and the autism claim
The combined measles, mumps and rubella vaccine dates from 1971. A later claim associating MMR with autism became one of the best-known vaccine controversies. Our evidence explainer examines what subsequent research found.
HPV vaccination
The first HPV vaccine was approved in 2006. Debate has included safety, adolescent vaccination, sexual-health misconceptions and public understanding of cancer prevention. A dedicated evidence page is planned for this archive.
COVID-19: speed, uncertainty and unprecedented scrutiny
COVID-19 vaccines were developed and deployed at unprecedented speed during a global emergency. The period generated intense debate about trials, mandates, adverse events, changing recommendations and misinformation. Archive entries will distinguish contemporaneous uncertainty from evidence accumulated later.
How this archive will grow
Future entries can add original documents, claim timelines, regulatory decisions, systematic reviews, corrections and “what we know now” summaries. Every substantive medical claim should link to an identifiable source and carry a review date.