Vibrio cholerae · 7 pandemics
Cholera
A disease that can kill a healthy adult in hours — yet a glass of salt-and-sugar water saves 99% of patients. The cause, the symptoms, the seven pandemics, and why it still kills tens of thousands a year.
Short answer
Cholera is an acute infection caused by Vibrio cholerae swallowed in contaminated water. It causes violent watery diarrhoea and can kill through dehydration within hours. Yet oral rehydration therapy saves about 99% of patients. The WHO estimates 1.3–4 million cases and up to 143,000 deaths a year — entirely a disease of unsafe water and poor sanitation.
Key facts
hours–5d
Onset
~50%
Untreated fatality (severe)
~1%
With rehydration
7
Pandemics since 1817
Why it kills so fast — and why it's so easy to treat
The Vibrio cholerae toxin makes the small intestine pump water and salts out of the body — a severe case can lose up to a litre of fluid an hour, until blood pressure collapses. But because the body is simply losing fluid and salts, replacing them works almost magically: oral rehydration solution (clean water + salt + sugar) lets the gut reabsorb fluid faster than the toxin expels it. Cheap, no electricity needed, saves around 99%.
The seven cholera pandemics
| # | Years | Note |
|---|---|---|
| 1st | 1817–1824 | Begins in the Ganges delta; spreads across Asia. |
| 2nd | 1829–1837 | Reaches Europe and North America for the first time. |
| 3rd | 1846–1860 | Deadliest. John Snow's 1854 Broad Street investigation. |
| 4th | 1863–1875 | Spreads via pilgrimage and expanding rail/shipping. |
| 5th | 1881–1896 | Koch identifies Vibrio cholerae (1883). |
| 6th | 1899–1923 | Heavy toll in India, Middle East, Russia. |
| 7th | 1961–present | El Tor biotype; still ongoing today. |
We are still living in the seventh pandemic, which began in 1961 and has never fully ended — a reminder that cholera is controlled by infrastructure, not by medicine alone.
Frequently asked questions
What causes cholera?
The bacterium Vibrio cholerae, swallowed in food or water contaminated by the faeces of an infected person. Its toxin triggers massive watery diarrhoea. It is fundamentally a disease of unsafe water and poor sanitation.
What are the symptoms?
Most infections are mild. Severe cases: profuse 'rice-water' diarrhoea, vomiting, and rapid dehydration within hours to 5 days. Untreated, severe cholera can kill within hours through fluid loss and shock.
How is cholera treated?
Rehydration. Oral rehydration solution (clean water with salts and sugar) saves ~99% of patients. Severe cases need IV fluids. Antibiotics shorten illness but are secondary to fluids.
How does cholera spread?
Faecal-oral: ingesting water or food contaminated with infected faeces. It spreads explosively where sewage mixes with drinking water — refugee camps, slums, flood/war zones. Not by casual contact.
How many cholera pandemics have there been?
Seven. The first began in 1817; the third (1846–1860) prompted John Snow's famous 1854 study, a founding moment of epidemiology. The seventh began in 1961 and is still ongoing.
Is cholera still a problem today?
Yes — the WHO estimates 1.3–4 million cases and 21,000–143,000 deaths a year. Major recent outbreaks: Haiti (2010), Yemen (the largest ever, 2.5M+ suspected cases), sub-Saharan Africa.
Who was John Snow and why does he matter?
A London physician who, in the 1854 Broad Street outbreak, mapped deaths to a single contaminated water pump — disproving the 'bad air' theory and founding modern epidemiology.
Related
History
The Black Death — 75–200M dead
Pandemic
Spanish Flu 1918 — 50M dead
Disease
Bubonic plague — symptoms & cases
Tool
DeathVault home — interactive map
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Informational only — not medical advice. For symptoms, contact a healthcare professional.