What should you know about cholera incidence?

Cholera spreads when bacteria from infected stool reach food or water and are then swallowed. Communities with disrupted water systems, overcrowding, flooding, or limited sanitation may face greater exposure. Cases can appear as a cluster because many people share the same source. Incidence describes how often illness occurs in a population or place; it does not show whether any individual with diarrhoea has cholera.

A sudden outbreak can require public-health teams to test water, trace exposure, and advise residents. The symptom to watch is profuse watery diarrhoea, which can cause dehydration. See [Diarrhoea](/symptoms/diarrhoea/) for symptom guidance.

Drink water that has been boiled or reliably treated, and keep it in a clean covered container. Wash hands with soap after toilet use and before preparing food. Cook food thoroughly, peel produce when possible, and avoid raw items washed in unsafe water. If you develop watery diarrhoea during a suspected outbreak, start [Oral Rehydration Therapy](/treatments/acute-and-urgent-care/oral-rehydration-therapy/) and arrange medical assessment without delay.

Go for urgent care if stools are frequent or watery, vomiting prevents drinking, urine becomes scarce, or you feel dizzy, weak, confused, or faint. Children and frail adults need particularly close observation. A healthcare team may use [IV Fluid Therapy](/treatments/acute-and-urgent-care/iv-fluid-therapy/) when oral fluids cannot replace losses adequately.

Ask which local water advice applies, whether testing is needed, how to prepare oral rehydration, and what symptoms should trigger emergency attendance.