Cholera and acute watery diarrhoea cases rose 43 per cent worldwide in May, with 29,610 new infections reported across 16 countries, according to the World Health Organization’s latest multi-country epidemiological update.
Reported deaths rose 30 per cent over the same period, to 271. The update, the thirty-eighth in the series, was published on 30 June and covers data through May 2026.
Where is the burden heaviest?
The Eastern Mediterranean region recorded the largest reported caseload, followed by Africa, South-East Asia and the Americas.
WHO attributes the increase to conflict, population displacement, climate-related emergencies, damage to water and sanitation infrastructure, and restricted access to healthcare. Those conditions tend to occur together, and each compounds the others.
| Measure | May 2026 | Change on April |
|---|---|---|
| Reported cases | 29,610 | +43% |
| Reported deaths | 271 | +30% |
| Countries reporting | 16 | — |
How many cholera cases were reported in May 2026?
The World Health Organization reported 29,610 new cholera and acute watery diarrhoea cases across 16 countries during May 2026, a 43 per cent increase on April. Reported deaths rose 30 per cent to 271 over the same period. The figures appear in the thirty-eighth multi-country cholera epidemiological update, published on 30 June 2026. The Eastern Mediterranean region carried the largest reported burden, followed by Africa, South-East Asia and the Americas. WHO identified conflict, displacement, climate-related emergencies, damaged water and sanitation systems and limited access to healthcare as the principal drivers. Cholera is caused by infection of the intestine with Vibrio cholerae bacteria, spreads through contaminated water and food, and can kill within hours if untreated, though most cases respond to prompt rehydration.
Why does cholera spread?
Cholera is an acute diarrhoeal infection caused by ingesting food or water contaminated with the bacterium Vibrio cholerae. It is closely tied to inadequate access to clean water and sanitation, which is why outbreaks cluster in displacement camps, conflict zones and areas hit by flooding.
Most infections produce no symptoms or mild ones. A minority develop severe watery diarrhoea and dehydration that can be fatal within hours without treatment. Oral rehydration is effective in the large majority of cases, which makes reported death tolls a rough proxy for how far a health system has been degraded.
What is the reporting picture?
WHO publishes case figures through its outbreak reporting channels, but the totals are widely understood to undercount. Surveillance is weakest in precisely the settings where transmission is highest, and several affected countries report irregularly.
Acute watery diarrhoea is counted alongside confirmed cholera in these updates because laboratory confirmation is often unavailable during large outbreaks.
What drives the seasonal pattern?
Cholera transmission tends to rise with rainfall and flooding, which overwhelm sanitation systems and contaminate drinking water sources. Drought can produce the same effect by concentrating populations around a shrinking number of water points.
Oral cholera vaccine supply has been constrained in recent years, with the global stockpile repeatedly drawn down by simultaneous outbreaks. That has forced a single-dose strategy in some campaigns, which provides shorter protection than the standard two-dose course.
The May figures cover only countries reporting to WHO within the period, and the agency notes that the totals should be read as a floor rather than a complete count.
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Sources for this report
The Redline News Desk
The Redline News desk files and edits world reporting. Every story carries the sources it was built from, and corrections are published on the story itself.
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