Cholera
Bacterial infection causing severe diarrhea and dehydration.
Cholera is an infection of the small intestine caused by certain strains of the bacterium Vibrio cholerae. Symptoms can range from none to mild to severe, with the hallmark being large amounts of watery diarrhea that lasts for several days, often accompanied by vomiting and muscle cramps. This diarrhea can be so profuse that it leads to severe dehydration and electrolyte imbalance within hours, resulting in sunken eyes, cold or bluish skin, decreased skin elasticity, and wrinkling of the hands and feet; in severe cases, death can occur. Symptoms typically begin between two hours and five days after exposure. The disease is spread primarily through unsafe water and food contaminated with human feces containing the bacteria, with undercooked shellfish being a common source. Humans are the only known host. Risk factors include poor sanitation, lack of clean drinking water, and poverty. Diagnosis is made via stool test or a less accurate rapid dipstick test. Prevention focuses on improved sanitation and clean water access. Oral cholera vaccines provide reasonable protection for about six months and also guard against certain E. coli diarrhea. A single-dose live oral vaccine is approved for adults traveling to active transmission areas but offers limited protection for young children. Recovery from cholera confers long-lasting immunity for at least three years. Primary treatment involves oral rehydration salts, with rice-based solutions preferred; zinc supplementation helps children. Severe cases may require intravenous fluids like Ringer’s lactate and antibiotics guided by sensitivity testing. Cholera affects an estimated three to five million people worldwide annually, causing tens of thousands of deaths. Seven pandemics have occurred, the most recent starting in 1961 and continuing. The disease is rare in high-income countries and affects children most severely, occurring as outbreaks or chronically in Africa and Southeast Asia. Without treatment, the death rate can reach fifty percent, but with improved care it is usually under five percent. Descriptions of cholera date back to the fifth century BCE in Sanskrit literature. The term originally referred to any gastroenteritis in Europe until the early nineteenth century. John Snow’s study of cholera in England between 1849 and 1854 advanced epidemiology through his insights on waterborne transmission and the fi
- caused_by
- Vibrio cholerae bacteria
- primary_symptom
- Profuse watery diarrhea
- transmission
- Fecal-oral route via contaminated water or food
- annual_cases
- 3–5 million estimated
- treatment
- Oral rehydration salts, intravenous fluids, antibiotics
- vaccine
- Oral cholera vaccines, including Vaxchora
Lore & Background
Cholera is caused by various types of Vibrio cholerae, with some producing more severe disease than others. It spreads primarily through unsafe water and food contaminated with human feces, with undercooked shellfish being a common source. Humans are the only known host. Symptoms typically begin two hours to five days after exposure and can range from none to severe, with the classic sign being large amounts of watery diarrhea that can lead to life-threatening dehydration and electrolyte imbalance within hours. Severe cases may result in sunken eyes, cold or cyanotic skin, decreased skin elasticity, and death.
Reader's Guide
Cholera remains a major public health challenge, affecting an estimated 3–5 million people annually and causing tens of thousands of deaths. Its significance lies in its rapid onset and potential for high mortality without treatment—up to 50% in severe cases—though with proper care, the risk of death drops below 5%. The disease is rare in high-income countries but persists in Africa and Southeast Asia, with outbreaks increasing due to climate change. Prevention relies on improved sanitation and clean water access, while oral vaccines provide about six months of protection. The study of cholera by John Snow in the 19th century advanced epidemiology through his mapping of a London outbreak, demonstrating waterborne transmission. Today, treatment with oral rehydration salts and, in severe cases, intravenous fluids and antibiotics, has dramatically reduced mortality, though access remains uneven.
Did You Know?
- Cholera has been nicknamed the 'blue death' because a person's skin may turn bluish-gray from extreme fluid loss.
- An untreated person with cholera may produce 10 to 20 liters of diarrhea per day.
- People with blood type O are the most susceptible to cholera infection.
- Certain CFTR mutations other than delta-F508 provide a selective advantage against V. cholerae in heterozygous carriers.
Frequently Asked Questions
Who is Cholera?
Cholera is an acute intestinal infection triggered by specific strains of the bacterium Vibrio cholerae. It targets the small intestine and is responsible for an estimated three to five million new cases worldwide every year.
What are Cholera's powers or primary effects?
Its signature effect is a sudden onset of profuse, watery diarrhea that rapidly strips the body of fluids and electrolytes. If left unaddressed, the resulting severe dehydration can prove fatal within hours.
How does Cholera spread to new hosts?
Transmission follows the fecal-oral route, typically through drinking water or eating food contaminated with the bacteria. Poor sanitation and lack of clean water supply are the main drivers of outbreaks.
How is Cholera treated?
The cornerstone of treatment is aggressive rehydration using oral rehydration salts or intravenous fluids to replace lost electrolytes. Antibiotics may be added in severe cases to shorten the duration of illness.
Is there a way to prevent Cholera?
Yes—oral cholera vaccines, including the licensed product Vaxchora, are available and recommended for travelers to endemic regions. Safe water, proper sanitation, and hand hygiene remain the most effective long-term prevention strategies.
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