Cholera cases are down a fifth this year. Deaths are up by nearly half
WHO counted 409,222 cases and 4,738 deaths across 31 countries by 17 August. The divergence between the two trends is the finding, and it points at case management, not transmission.
The World Health Organization's multi-country cholera update, published on 29 August, contains a comparison that inverts the usual reading of outbreak data [s1]. Between 1 January and 17 August 2025, 409,222 cholera and acute watery diarrhoea cases and 4,738 deaths were reported globally from 31 countries [s1]. Over the same period in 2024, there were 510,638 cases and 3,248 deaths from 28 countries [s1].
That is a 20% decrease in cases and a 46% increase in deaths [s1].
What a diverging trend means
Cholera is one of the more treatable serious infections. Most cases are managed successfully with prompt oral rehydration solution, and the incubation period runs from 12 hours to five days [s1]. Deaths occur when treatment does not arrive in time.
So a rising death count against a falling case count points less at the pathogen and more at access to care. WHO makes this explicit: six of the 31 countries reported case fatality rates above 1%, which the organisation describes as indicating serious gaps in case management and delayed access to care [s1].
The country-level figures show what that looks like. In Chad, which officially confirmed an outbreak on 24 July after a first suspected case on 13 July in Dougui Camp, Chokoyane health district, Ouaddaï province along the Sudan border, 776 cases and 53 deaths were reported between 13 July and 19 August — a case fatality rate of 6.8% [s1]. Twenty-seven of those 53 deaths occurred in the community rather than in a health facility [s1].
In the Republic of the Congo, 457 suspected cases and 35 deaths were reported between 23 June and 17 August, a case fatality rate of 7.7%, with Congo-Oubangui at 11.7% (188 cases, 22 deaths) against Brazzaville's 4.8% (269 cases, 13 deaths) [s1].
Community deaths and double-digit case fatality rates in a disease treatable with oral rehydration salts are a measure of distance from care, not of virulence.
Where the burden sits
By region for 2025, the Eastern Mediterranean recorded the highest case numbers — 230,991 across six countries — followed by the African Region with 172,750 across 23 countries, South-East Asia with 2,985 across five countries, and the Americas with 2,496 in one country [s1]. The European and Western Pacific regions reported no outbreaks [s1].
Deaths run the other way. The African Region recorded 3,763 deaths at a case fatality rate of 2.2%, against the Eastern Mediterranean's 943 deaths at 0.4% [s1]. The Americas recorded 31 deaths (1.2%) and South-East Asia one (0.03%) [s1].
The largest national outbreaks: South Sudan reported 71,825 suspected cases and 1,194 deaths from 1 January to 17 August, a case fatality rate of 1.7%, affecting 55 of 80 counties [s1]. Sudan reported 48,768 cases and 1,094 deaths to 11 August (2.2%), across all 18 states, with 72% of cases from Khartoum, North Kordofan and White Nile [s1]. The Democratic Republic of the Congo reported 46,800 cases and 1,362 deaths to 10 August (2.9%), in 16 of 26 provinces, with Kinshasa alone recording 1,781 cases and 136 deaths at a case fatality rate of 8% [s1].
WHO adds a caution that should govern how all of these figures are read: case definitions and reporting systems differ across countries and regions, which affects comparability, and the data likely underestimate the true burden [s1].
The map is moving
A study published in Nature Medicine on 7 August provides the longer-run spatial picture behind the current surge [s2]. Researchers used surveillance data and spatial statistical models to estimate mean annual incidence of reported suspected cholera on a 20-km grid across Africa, comparing 2011-2015 with 2016-2020 [s2].
Across 43 countries, mean annual incidence stayed level at 11 cases per 100,000 population, with an estimated 125,701 cases annually (95% credible interval, 124,737 to 126,717) in 2016-2020 [s2]. But the geography changed: incidence shifted from western to eastern Africa [s2].
The scale of that shift is the finding. By 2020, 296 million people (95% CrI, 282 to 312 million) lived in second-level administrative units with high incidence of at least 10 cases per 100,000 per year — and 135 million of them had experienced low incidence, under 1 per 100,000, in 2011-2015 [s2]. Units with high incidence in central and eastern Africa across 2011-2020 were more likely to report cholera in 2022-2023 [s2].
The study also tested what that instability means for prevention planning. In hypothetical scenarios, targeting the 100 million highest-burden populations could have reached up to 63% of mean annual cases in 2016-2020, but only 37% when targeting was based on past incidence [s2].
That gap is a direct challenge to how oral cholera vaccine campaigns and water and sanitation investments are prioritised. Planning from where cholera was is substantially worse than planning from where it is.
The drivers WHO names
WHO attributes the deteriorating situation to conflict, mass displacement, disasters from natural hazards and climate change, which intensify outbreaks particularly in rural and flood-affected areas where poor infrastructure and limited healthcare access delay treatment [s1]. Cholera is resurging in countries that had not reported substantial numbers in years, including Chad and the Republic of the Congo, while the Democratic Republic of the Congo, South Sudan and Sudan continue outbreaks carried over from 2024 with significant geographic expansion [s1].
WHO's own conclusion on prevention is unambiguous and unglamorous: safe drinking water, sanitation and hygiene are the only long-term and sustainable solutions to ending the cholera emergency and preventing future ones [s1]. Given the scale and interconnection of these outbreaks, WHO considers the risk of further spread within and between countries very high [s1].
On 26 August, Africa CDC and WHO launched a Continental Cholera Emergency Preparedness and Response Plan for Africa 1.0, alongside a joint Incident Management Team, following a commitment by African heads of state and government who pledged to control and eliminate outbreaks by 2030 [s1].
What to watch
Whether the case fatality rate falls is the measure that matters over the next months, more than whether case counts fall. Cases track transmission and reporting; deaths track whether rehydration reaches people. On WHO's figures for 2025 so far, transmission has slowed and survival has not improved [s1].
Sources
- Cholera - Multi-country with a focus on countries experiencing current surges — World Health Organization, Disease Outbreak News, 2025-08-29
- Geographical shifting of cholera burden in Africa and its implications for disease control — Nature Medicine, 2025-08-07
Sources
- Cholera - Multi-country with a focus on countries experiencing current surges — World Health Organization, Disease Outbreak News , August 29, 2025
- Geographical shifting of cholera burden in Africa and its implications for disease control — Nature Medicine , August 7, 2025
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