CholeraCholera is an extremely virulent disease which is caused by ingesting contaminated water or food.
- Cholera is an extremely virulent disease which is caused by ingesting contaminated water or food1,2
- The disease is endemic in Africa, Asia and Central and South America and prevalent in areas where there is poor sanitation1,4
- It is estimated that every year, there are roughly 1.3 to 4 million cases, and 21,000 to 143,000 deaths per year worldwide due to cholera1
- Symptomatic cholera is shown by watery diarrhoea, vomiting and severe dehydration, which can lead to death if not treated1,2
- Cholera can usually be treated but travellers can reduce the risk of contracting the disease with vaccination2
What is cholera?
Cholera is an acute diarrhoeal infection which is caused by ingesting water or food that has been contaminated with Vibrio cholerae bacteria from faeces of infected people.1 It is an extremely virulent disease, causing death in both adults and children within hours in some case.1,2
Risk areas for cholera4
Risk areas for cholera
Adapted from: World Health Organization. Countries reporting cholera, 2010 – 2015
Where does cholera occur?
Cholera can be both endemic and epidemic. Cholera is endemic to many parts of the world which are popular traveller destinations, including Africa, Asia, South America, and Central America.2-4 It is most likely to occur in places where there is inadequate water treatment, hygiene and poor sanitation such as peri-urban slums and refugee camps.1,2 Bacteria may also be contracted in brackish rivers or coastal waters and shellfish eaten raw from these areas may also be a source of cholera disease.2
Who is at risk of contracting cholera?
Travellers visiting places with poor sanitation are at greatest risk of contracting cholera.1,2 Volunteers, aid workers and medical personnel in disaster relief situations and those travelling to work in slums/refugee camps, areas affected by natural disasters, or countries experiencing cholera outbreaks are most vulnerable.5 Cholera is not spread directly from person to person, therefore contact with infected people is not a risk factor.2
What are the symptoms and lasting effects of cholera?
In the majority of people who become infected with cholera, the disease is asymptomatic. However, V. cholerae will be present in the faeces of infected individuals for up to 10 days following infection and will be released into the environment to potentially infect other people.1 People who do experience symptoms develop either mild-to-moderate symptoms or acute watery diarrhoea, vomiting and leg cramps with severe dehydration, which can lead to death if left untreated.1,2 In pregnant women, cholera can cause miscarriages and premature birth.5
How can cholera be treated?
Treatment for cholera involves rehydration following the loss of fluids from diarrhoea. Patients can be treated with large volumes of oral rehydration solution, which is a preparation of sugar and salts mixed with water. Severe cases may require intravenous fluid replacement and antibiotics may also be administered to shorten the length of diarrhoea episodes and decrease the excretion of V. cholerae bacteria. With prompt administration of rehydration fluids, less than 1% of cholera patients should die.1-3 Any person who develops severe diarrhoea and vomiting in a country where cholera is known to occur should seek medical attention immediately.
How can you prevent cholera?
Oral vaccination can help prevent cholera. You can also reduce the risk further by taking simple precautions with food, drinks and hygiene.2
- World Health Organization. Cholera. Factsheet no.107. October 2016. Available online: who.int (Last accessed April 2017).
- Centers for Disease Control and Prevention. Cholera. General Information. November 2016. Available online: cdc.gov (Last accessed April 2017).
- Zuckerman JN, Rombo L, Fisch A. The true burden and risk of cholera: implications for prevention and control. Lancet Infect Dis 2007; 7: 521–530.
- World Health Organization. Countries reporting cholera, 2010-2015. Available online: gamapserver.who.int (Last accessed April 2017).
- European Centre for Disease Prevention and Control. Health Topics. Cholera. Factsheet. Available online: ecdc.europa.eu (Last accessed April 2017).