Reported cases fell in 2025 while deaths rose. The divergence highlights why a smaller surveillance total cannot, on its own, establish progress.
The World Health Organization’s September update records 451,499 cholera cases and 7,870 deaths reported by 47 countries in 2025. Its detailed annual report compares these with 560,823 cases and 6,028 deaths in 2024. These are notifications submitted to WHO, rather than estimates of every infection or death worldwide.12
How to read the exhibit. An index makes changes in two differently sized totals comparable. It does not make their levels comparable: a death index of 130.6 is not a count of 130.6 deaths. Returning to the original counts is essential before judging the scale of the burden. A consistent reporting panel would answer a narrower question about change in the same places; the global totals answer a broader question about notifications received.
Analysis. Reading only the case total would produce a reassuring impression that the death total does not support. Equally, the divergence cannot establish that the infection has become intrinsically more dangerous. A surveillance system counts what it detects and receives; it is not a controlled comparison of equivalent patients.
WHO identifies substantial concentration of the reported burden in seven countries. It also reports deaths occurring outside health facilities, underlining the importance of reaching treatment quickly. Cholera can cause life-threatening dehydration within hours; oral rehydration treats most cases, while severe illness requires intravenous fluids and other clinical care.13
Prevention involves safe drinking water, sanitation and hygiene, alongside surveillance and oral vaccination. WHO says limited surveillance and concerns about consequences for trade and tourism contribute to under-reporting. Improvements in detection can therefore increase recorded cases even when they improve the public-health response.3
Analysis. A useful assessment needs both prevention and access-to-care measures. The annual totals provide an alarm signal, but do not identify how much of the change reflects transmission, detection, treatment delays or the places affected.
The country reporting pool changed: 60 countries reported cases in 2024, compared with 47 in 2025. Definitions and death recording also vary. The data cannot fully separate genuine changes in disease burden from changes in reporting.2
Cases and deaths answer different questions. Both should be followed, with reporting coverage visible beside them.