Cholera is preventable through a combination of safe water practices, proper hygiene, food safety, and vaccination. The bacterium spreads almost exclusively through contaminated water and food, so the most effective prevention comes down to controlling what you drink, how you prepare food, and how waste is managed. In 2025 alone, over 600,000 cholera cases and more than 7,600 deaths were reported worldwide, mostly in regions where sanitation infrastructure is vulnerable to flooding, hurricanes, and other extreme weather.
How Cholera Spreads
Cholera is caused by a bacterium that lives naturally in fresh and brackish water, often attached to tiny organisms like zooplankton, shellfish, and aquatic plants. You get infected most often by drinking untreated water where the bacterium either occurs naturally or has been introduced through the feces of someone who is already sick. This is why outbreaks tend to follow floods, hurricanes, and heavy rains: these events overwhelm sewage systems and push contaminated water into drinking supplies.
Person-to-person spread is uncommon. The real danger is the water cycle. One infected person’s waste contaminates a shared water source, and dozens or hundreds of people drink from it before anyone realizes there’s a problem.
Make Your Water Safe
Treating your water at home is the single most impactful step. Household water treatment methods like chlorination, filtration, and solar disinfection reduce the risk of cholera by roughly 47%, based on a meta-analysis of multiple studies. Here are the three main options:
- Boiling: Bring water to a rolling boil for one full minute. This kills the cholera bacterium reliably. The catch is that boiled water can be recontaminated afterward, so store it in a clean, covered container.
- Chlorination: Use a locally available chlorine product designed for drinking water and follow the label instructions. Chlorine is cheap, widely available, and effective, but it needs time to work before the water is safe to drink.
- Filtration: Use a filter with a pore size of 0.3 microns or smaller. Filtration alone isn’t enough. Follow up with a disinfectant like chlorine to catch anything that slips through. Store filtered water the same way you would boiled water: covered and clean.
Use treated or bottled water (with an unbroken seal) for everything, not just drinking. That includes brushing your teeth, washing produce, preparing food, and making ice. Piped water, drinks sold in cups or bags, and ice from unknown sources may not be safe in areas where cholera is active.
Handwashing and Hygiene
Washing your hands with soap and safe water is the second line of defense. The CDC recommends washing at these specific times:
- Before, during, and after preparing food
- Before and after eating or feeding children
- After using the toilet
- After cleaning a child’s bottom
- After caring for someone sick with diarrhea
If soap and safe water aren’t available, use an alcohol-based hand sanitizer with at least 60% alcohol. It’s not as effective as soap and water for all pathogens, but it’s far better than nothing.
Food Safety That Actually Matters
The old traveler’s rule, “peel it, cook it, or leave it,” applies directly to cholera prevention. The bacterium doesn’t survive cooking temperatures, so thoroughly cooked food served hot is safe. The risks come from raw produce washed in contaminated water, seafood harvested from contaminated sources (especially shellfish), and food that has been sitting at room temperature where flies or dirty hands can reach it.
Wash and prepare all food with treated water. Clean kitchenware, cutting boards, and food preparation surfaces with soap and safe water, and let them dry completely before using them again. Drying matters because the bacterium needs moisture to survive on surfaces.
Sanitation and Waste Management
Proper disposal of human waste is what stops cholera from entering the water supply in the first place. Use a toilet or a safely managed sanitation facility whenever possible, including for children’s waste, which is just as infectious as an adult’s.
If no toilet is available, the CDC recommends defecating at least 30 meters (about 100 feet) from any body of water, including wells, and burying waste. Temporary pit latrines should be dug at least half a meter deep and at least 30 meters from water sources. Bathe and wash clothes or diapers at least 30 meters from drinking water sources as well.
Disinfecting Surfaces During an Outbreak
If someone in your household is sick, surface disinfection becomes critical. The cholera bacterium survives on surfaces contaminated with vomit or feces, and standard cleaning isn’t enough. You need bleach solutions at specific strengths, using regular unscented household bleach (5 to 6% active chlorine).
For surfaces directly touched by vomit, feces, or the body of a sick person, mix a strong solution: 2 parts bleach to 3 parts water. For general household disinfection of toilets, showers, bedding, clothing, food utensils, and kitchen surfaces, a weaker solution works: 1 part bleach to 9 parts water. Clean the surface with soap first to remove visible contamination, then apply the bleach solution. Dispose of the soapy water and disinfectant by pouring them into a drain, toilet, or latrine.
Cholera Vaccines
Two oral cholera vaccines are approved by the WHO: Dukoral and Euvichol-Plus. Neither is available in the United States, but they’re widely used in outbreak-prone regions. Both are taken by mouth, not injected.
Euvichol-Plus requires two doses given at least two weeks apart and provides protection for at least three years. A single dose offers shorter protection, roughly one year. Dukoral also requires two doses (three for children aged 2 to 5) given one to six weeks apart, with protection lasting about two years.
Because of global vaccine shortages, the WHO currently recommends a single-dose strategy for outbreak responses, which provides at least six months of protection and helps bring outbreaks under control quickly. Two-dose schedules are considered on a case-by-case basis as supply improves. Vaccination works best alongside clean water and sanitation efforts, not as a replacement for them.
If You’re Traveling to a High-Risk Area
Cholera outbreaks are concentrated in parts of sub-Saharan Africa, South Asia, and the Caribbean, particularly after natural disasters or in areas with limited water infrastructure. If you’re traveling to one of these regions, your prevention checklist is straightforward: drink only bottled or treated water, eat only cooked food served hot, avoid raw shellfish and salads, wash your hands frequently, and ask about vaccine availability before your trip.
Warm temperatures combined with heavy rainfall are the conditions most likely to trigger outbreaks. If you’re in an affected area during rainy season or after flooding, be especially vigilant about your water source, even if local infrastructure seemed reliable before.