The Dawn of Vaccination: From Variolation to the First Vaccine
Long before modern medicine, societies sought ways to prevent smallpox. Inoculation — deliberately exposing a person to mild smallpox material to trigger immunity — appeared in China around the 1500s. That practice eventually spread to Europe in the early 1700s. But the decisive breakthrough came in 1796, when English physician Edward Jenner used material from cowpox lesions to inoculate an 8-year-old boy. This method proved safer and more reliable than the older inoculation techniques. Jenner built directly on those earlier folk practices of variolation, which had been documented across Asia and Africa. His work marked the first recorded vaccination.
Nearly a century later, in 1885, Louis Pasteur developed the first rabies vaccine, another turning point in the biological fight against infectious disease. The 20th century then brought a cascade of breakthroughs. According to the medical literature, the diphtheria vaccine arrived in 1913, followed by the BCG vaccine for tuberculosis in 1921. Jonas Salk’s polio vaccine was introduced in 1955, and Albert Sabin’s oral version followed in 1961. The measles vaccine came in 1963, the mumps vaccine in 1967, and the rubella vaccine in 1969.
Eradication and the Global Immunization Campaign
The World Health Organization launched its Expanded Programme on Immunization in 1974. The crowning achievement of this global effort came in 1980, when smallpox was declared eradicated after a sustained vaccination campaign. The intensive push had begun in the 1960s; the last naturally occurring case was diagnosed in 1977. Smallpox remains the only human disease ever eliminated by design. That success proved that vaccines, when deployed widely, could wipe out a scourge, and it laid the foundation for all subsequent immunization efforts.
The impact of routine vaccination has been enormous. By 2020, public health data showed that vaccines were preventing an estimated 2-3 million deaths annually from diphtheria, tetanus, pertussis, and measles alone. UNICEF figures indicate that vaccines have reduced child mortality by over 50 percent since 1990.
The Unprecedented Pace of COVID-19 Vaccination
The COVID-19 pandemic fundamentally altered the timeline of vaccine development. The first authorized vaccine — the Pfizer-BioNTech product — received emergency use authorization in December 2020, just 11 months after the SARS-CoV-2 virus was sequenced. That pace was unprecedented in the history of medicine. As of 2023, over 13 billion COVID-19 vaccine doses had been administered globally. The scale of that deployment represented the largest and fastest vaccination campaign ever conducted.
Vaccines are biological preparations that provide active acquired immunity to particular infectious diseases. The mechanism remains consistent across all these efforts, from Jenner’s cowpox material to the mRNA technology of today. The science, refined over more than two centuries, continues to evolve. The story of smallpox shows how a single disease, once a constant threat, can be consigned to history through science and collective action. Consult your doctor for medical advice.
