History of Smallpox: From Ancient Scourge to Eradication

Smallpox, caused by variola virus, plagued humanity for millennia. Evidence suggests origins in ancient Egypt or India (~3000 BCE). It spread globally via trade, war, and exploration.

Key Historical Milestones

• Antiquity–Middle Ages: Epidemics in China, Greece, Rome; high mortality, severe scarring.
• Colonization of Americas (1500s+): Devastated Indigenous populations with no immunity; facilitated European conquest.
• 18th Century: Variolation (intentional infection with mild smallpox) practiced; risky but reduced mortality.
• 1796: Edward Jenner develops vaccination using cowpox virus — safer, effective.
• 19th–20th Century: Vaccination campaigns reduce incidence; WHO launches global eradication program (1967).
• 1977: Last natural case (Somalia).
• 1980: WHO declares smallpox eradicated — first and only human disease eliminated by vaccination.

Remaining variola stocks are held in two high-security labs (CDC Atlanta, VECTOR Russia). Research continues on safer vaccines and antivirals for biodefense.