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Health condition · Clinically reviewed

Cholera, rapid rehydration, antibiotics and vaccination for travellers.

Rare in the UK but a leading cause of severe watery diarrhoea worldwide. Prompt fluid resuscitation turns a life-threatening illness into a curable one.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against WHO, UKHSA and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK travel medicine, WHO cholera case management and current vaccine availability.

Key facts

Cholera at a glance.

The essentials, in plain English - what it is, where it happens, and how it is treated in the UK today.

  • What it is

    Acute intestinal infection caused by Vibrio cholerae serogroup O1 (Inaba, Ogawa) or O139, producing a toxin that drives massive watery diarrhoea.

  • Global burden

    WHO estimates 1.3 to 4 million cases and 21,000 to 143,000 deaths worldwide each year, concentrated in Africa, Asia, Yemen and Haiti.

  • UK picture

    Rare in the UK and almost always seen in returning travellers or new arrivals from endemic regions. Notifiable to UKHSA within 24 hours.

  • How it spreads

    Faecal-oral, mostly via contaminated water and raw shellfish, driven by poor sanitation and hygiene.

  • Danger

    Severe disease can kill within hours through profuse dehydration and shock. Mortality falls from 50 percent untreated to under 1 percent with prompt fluids.

  • Cornerstone care

    Rapid rehydration with oral rehydration solution or intravenous Ringer's lactate. Antibiotics shorten illness but do not replace fluids.

Why this guide matters

Fluids first, always.

Cholera can kill within hours or resolve in days - the difference is nearly always the speed and volume of rehydration.

  • Rehydration is the whole ballgame

    Oral rehydration solution or intravenous Ringer's lactate turns 50 percent mortality into under 1 percent.

  • Antibiotics are helpful, not curative

    A single dose of doxycycline or azithromycin shortens illness and reduces shedding but does not replace fluids.

  • Vaccination is available privately

    Dukoral is offered through UK travel clinics for high-risk travellers, humanitarian and relief workers.

How the diagnosis is made

From travel history to a clear plan.

The steps a UK clinician will normally follow, in order - so you know what to expect and why.

  1. 01

    Assessing

    Travel and exposure history

    A structured history of recent travel to endemic regions, contaminated water sources, raw shellfish or humanitarian settings.

  2. 02

    Assessing

    Clinical severity assessment

    WHO dehydration classification (no, some, severe), stool volume and vomiting frequency guide immediate management.

  3. 03

    Assessing

    Isolate and notify

    Isolate with enteric precautions and notify UKHSA within 24 hours. International reporting to WHO applies.

  4. 04

    Confirming

    Stool microbiology

    Dark-field microscopy for comma-shaped darting motility, culture on TCBS agar (yellow colonies), PCR and rapid dipstick antigen.

  5. 05

    Confirming

    Bloods

    U and Es, glucose, blood gas, calcium, lactate and FBC to detect hypokalaemia, hyponatraemia, hypoglycaemia, acidosis and acute kidney injury.

  6. 06

    Following up

    Response monitoring

    Hourly review of fluid balance, urine output, vitals and electrolytes during the resuscitation phase.

  7. 07

    Following up

    Post-recovery follow-up

    Household screening, water and sanitation review, and travel vaccination advice for future trips.

Typical timeline: from first suspicion to a controlled recovery in hours, not days.

Symptoms

What cholera actually looks like.

A spectrum from silent carriage through mild diarrhoea to cholera gravis, with rapid dehydration and shock. Incubation is hours to five days.

  • Rice-water stools

    Profuse painless watery diarrhoea with flecks of mucus and a faint fish-like odour. Blood and leukocytes are usually absent.

  • Vomiting

    Early, effortless vomiting is common and compounds fluid loss.

  • Rapid dehydration

    Sunken eyes, dry mucous membranes, poor skin turgor and thirst can appear within hours.

  • Hypovolaemic shock

    Cool peripheries, weak thready pulse, hypotension and altered consciousness in severe disease.

  • Electrolyte disturbance

    Hypokalaemia with muscle weakness and cramps, hyponatraemia, hypoglycaemia and metabolic acidosis.

  • Asymptomatic carriage

    Around three in four infections cause no symptoms but still shed the organism and can seed outbreaks.

  • Mild self-limiting illness

    Many symptomatic cases are mild and settle with oral rehydration alone.

  • Red flag - cholera gravis

    Losses of up to a litre per hour, collapse or anuria demand immediate intravenous resuscitation.

Treatment

How cholera is managed to WHO standards.

Rehydration first, a single-dose antibiotic to shorten illness, zinc in children, and vaccination for travellers heading into risk.

  • Oral rehydration solution

    WHO reduced-osmolarity ORS is the mainstay for mild to moderate dehydration. Rice-based ORS can help in severe illness.

  • IV Ringer's lactate

    First-line intravenous fluid for severe dehydration and shock. Very large volumes (up to 200 mL per kg in the first 24 hours) may be needed.

  • Doxycycline

    A single 300 mg oral dose is first-line in adults. Shortens illness, reduces stool volume and cuts shedding.

  • Azithromycin

    A single 1 g oral dose is the preferred alternative for children, in pregnancy and where doxycycline is contraindicated.

  • Ciprofloxacin

    An alternative oral antibiotic, though resistance is emerging in several endemic regions.

  • Zinc supplementation

    Zinc 20 mg daily for 10 to 14 days reduces duration and severity in children.

  • Electrolyte and glucose support

    Potassium replacement for hypokalaemic weakness or arrhythmia, glucose for hypoglycaemia, and continued nutrition including breastfeeding.

  • Oral cholera vaccine (Dukoral)

    Inactivated whole-cell vaccine with recombinant B subunit. Two oral doses 7 to 42 days apart, booster at two years. Around 85 percent protection at six months.

What this guide is based on

The sources behind every claim on this page.

WHO, UKHSA and UK travel-medicine guidance, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your travel-medicine clinician, GP or infection specialist knows your history and can tell you which parts apply to you. If you feel unwell after travel, get seen the same day.

  • World Health Organization. Cholera fact sheet and Global Task Force on Cholera Control.

  • UKHSA. Cholera: guidance, notification and outbreak management.

  • NaTHNaC (TravelHealthPro). Cholera country guidance and vaccine advice.

  • BNF and BNFc. Doxycycline, azithromycin and Dukoral prescribing information.

Red flags

When cholera needs urgent attention.

Most cases respond quickly to fluids. These are the situations that demand hospital-level care without delay.

  • Signs of shock

    Cool peripheries, tachycardia, hypotension or confusion after profuse diarrhoea need immediate intravenous resuscitation.

  • Anuria or oliguria

    Failing urine output suggests acute kidney injury and warrants HDU or ITU-level care.

  • Severe hypokalaemia

    Muscle weakness, cramps or ECG changes need urgent potassium replacement to prevent arrhythmia.

  • Vomiting preventing oral intake

    When ORS cannot be tolerated, escalate to intravenous fluids without delay.

  • Infants and older adults

    Both extremes tolerate fluid loss poorly and deteriorate faster. Lower threshold for admission.

  • Pregnancy

    Cholera in pregnancy carries higher risk of fetal loss. Azithromycin is preferred and admission is usual.

  • Cluster of cases

    Two or more linked cases suggest an outbreak. Notify UKHSA the same day and preserve stool specimens.

  • Comorbid disease

    Chronic kidney or heart disease complicates fluid balance and needs specialist input.

  • Suspected complications of therapy

    Pulmonary oedema from aggressive fluids or antibiotic reactions need review by an infection or acute medicine team.

Living with it

A preventable illness, with a clear playbook.

Four things that make the biggest difference before and during travel - preparation, safe water and food, vaccination where indicated, and acting on symptoms early.

A quiet reminder

Fluids are more important than any medicine.

Start ORS at the first loose stool. Antibiotics help, but they are not what saves lives - rehydration is.

  1. 01 Prepare

    Plan the trip properly

    For endemic destinations, humanitarian work or disaster relief, book a pre-travel appointment 4 to 6 weeks before departure.

  2. 02 Protect

    Safe water and food

    Bottled, boiled or purified water. Peel it, cook it or leave it. Avoid raw shellfish, salads and ice.

  3. 03 Vaccinate

    Consider Dukoral

    Two oral doses 7 to 42 days apart give around 85 percent protection at six months. A booster at two years maintains cover.

  4. 04 Act fast

    Rehydrate at the first sign

    Start ORS with the first loose stool and seek medical care early if losses are heavy or vomiting stops you drinking.

Frequently asked

Everything we get asked about cholera.

Quick answers on rehydration, antibiotics, Dukoral vaccination and safe travel.

  • What is cholera?

    Cholera is an acute intestinal infection caused by Vibrio cholerae serogroup O1 (Inaba or Ogawa) or O139. The bacterium releases cholera toxin, which drives massive secretion of chloride and water into the gut and produces the classic profuse watery diarrhoea.

  • How likely is cholera in a UK traveller?

    Cholera is rare in UK travellers because most trips involve short stays in urban areas with safe water. Risk rises with humanitarian work, disaster relief, long stays in endemic areas and eating raw shellfish. Around 75 percent of infections cause no symptoms, but severe illness can be life-threatening within hours.

  • How is cholera diagnosed?

    The diagnosis is clinical in the setting of travel or an outbreak, and confirmed on stool testing. Dark-field microscopy shows comma-shaped darting motility, culture on TCBS agar produces yellow colonies, and PCR and rapid dipstick antigen tests are available. UKHSA must be notified within 24 hours.

  • What is the main treatment?

    Rapid rehydration is the cornerstone. WHO oral rehydration solution treats mild to moderate dehydration, and intravenous Ringer's lactate treats severe dehydration and shock, often in very large volumes. Antibiotics such as doxycycline or azithromycin shorten illness but do not replace fluids.

  • Is there a vaccine?

    Yes. Dukoral is an oral inactivated vaccine given in two doses 7 to 42 days apart, with a booster at two years, and offers around 85 percent protection at six months. It is available privately through UK travel clinics and is recommended for high-risk travellers, humanitarian and relief workers.

  • What should I do if I develop severe diarrhoea after returning from an endemic area?

    Start oral rehydration straight away and seek urgent medical care. Tell the clinician exactly where you have travelled, what you ate and drank, and when symptoms began. Severe watery diarrhoea, vomiting that stops you drinking, faintness or reduced urine output need same-day assessment.

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