Plague.si
The AI history guide to humanity's pandemics - education only, not medical advice
Explore the history of plague and pandemic disease - from the Justinianic Plague and the Black Death to the Third Pandemic and beyond. This is a history and public-health-history resource, not a source of medical diagnosis or treatment. For symptoms or current health concerns, see a doctor or local health authority.
No card required · $9/mo Plus · $99/mo Premium
What you get
Everything Plague.si gives you
Pandemic timelines
Major outbreaks in chronological context, from antiquity to the 20th century.
How plague spread
The historical epidemiology of Yersinia pestis, explained clearly.
Social & cultural impact
How pandemics reshaped economies, art, religion, and law.
Saved study threads
Sign in free and keep every conversation for later study.
Go deeper
Pandemic History Library
A history and public-health-history reference. Not medical advice - see a doctor for symptoms or health concerns.
Major Outbreaks
- Justinianic Plague (541-549 CE) — One of the first well-documented pandemics, striking the Byzantine Empire under Justinian I.
- Black Death (1347-1351) — Killed an estimated 30-50 percent of Europe's population within a few years.
- Third Pandemic (1855-1959) — Began in China's Yunnan province and spread globally via steamship trade routes.
- Great Plague of London (1665-1666) — The last major outbreak in England, killing roughly a quarter of London's population.
Science of Plague
- Yersinia pestis — The bacterium identified as the cause of plague by Alexandre Yersin in 1894.
- Bubonic, pneumonic, septicemic forms — The three clinical presentations, differing in transmission and severity.
- Flea-rodent transmission — Historically spread via fleas carried by rats and other rodents.
- Modern antibiotic treatment — Plague is treatable today with antibiotics when caught early - always a matter for medical professionals.
Historical Impact
- Population and labor shocks — The Black Death's death toll caused severe labor shortages that reshaped feudal economies.
- Plague doctors — 17th-century physicians known for wearing beaked masks filled with aromatic herbs.
- Origins of quarantine — The word comes from the 40-day isolation period (quarantena) used in Venice and Dubrovnik.
- Religious and artistic response — Plague years influenced art, literature, and religious practice across affected societies.
Pricing
Simple plans that grow with you
Plus
$9/mo
- ✓200 questions per day
- ✓Full saved conversation history
- ✓Full pandemic timeline library
Premium
$99/mo
- ✓Unlimited questions
- ✓Extended deep-dive answers
- ✓Everything in Plus