A cholera treatment unit can look, from a distance, like rows of simple cots under canvas. The spacing between those cots, and the sequence a patient walks through to reach one, is not improvised. It follows a small set of layout rules that field organizations have converged on because cholera spreads through contaminated hands, surfaces, and water — and a treatment site built without those rules can itself become a transmission point.
The One-Meter Rule and Why It Exists
Guidance cited by the World Health Organization calls for more than one meter of separation between cholera cots — roughly 3.3 feet. That gap is not about patient comfort. Cholera patients in the acute phase produce large volumes of watery stool, and treatment teams move constantly between cots to check hydration status, replace intravenous lines, and clean spills. A narrow gap turns every one of those movements into a chance to drag contamination from one patient’s space into a neighbor’s. The spacing also has to accommodate the "cholera bed" itself — a cot with a hole cut in the canvas over a bucket, so stool can be collected and disinfected without the patient having to be moved. Field planning references built around a cholera treatment unit floor plan put the number of cots at roughly six to seven trolleys for every sixty admissions expected in a day, which is really a density planning figure as much as a spacing one: it tells a team how much floor area a given caseload needs once the one-meter gaps are factored in.
Contaminated Zone, Clean Zone
Every cot sits inside a zone, and the zone is what actually does the infection-control work. Field guidance from Médecins Sans Frontières divides a cholera treatment center into a "contaminated" zone and a "clean" or "neutral" zone, and the two are kept physically separate:
| Contaminated zone | Clean / neutral zone |
|---|---|
| Triage and screening | Staff-only areas |
| Hospitalization / admission wards | Kitchen |
| Observation and recovery areas | Office and stock storage |
| Waste disposal, chlorine preparation | Staff changing rooms |
| Corpse handling | Water storage (bladders) |
Wards inside the contaminated zone are also separated by patient category where space allows — admissions kept apart from recovery cases, and men, women, and severe-care patients given their own areas. The whole site is typically ringed with a fence, so the boundary between contaminated and clean is a physical line, not just a marked one.
One-Way Flow, From Screening to Discharge
A patient’s path through the unit only moves in one direction. Entry is through a screening and triage point, then into an admission or observation ward, then toward recovery, and out through a separate exit — never doubling back through an area a sicker patient has already passed through. Caregivers, staff, and waste each have their own circuit through the site as well, so a family member accompanying a patient does not cross paths with, say, the route used to move contaminated linens. Controlled entrances and exits are paired with decontamination points: arriving and departing people are sprayed with a chlorine solution and required to wash hands before moving on. Handwashing stations with soap and safe water sit at every entrance, every exit, and inside each ward — not as a single station at the gate, but repeated at each transition point along the one-way path.
Where the Outer Perimeter Gets Drawn
Layout decisions do not stop at the fence line. Sphere Standards guidance used for WASH planning in cholera response calls for latrines to sit at least 30 meters (about 98 feet) from any water source, with the base of a pit at least 1.5 meters (about 5 feet) above the groundwater table, so waste cannot migrate into the water supply the surrounding community depends on. The same logic pushes the site selection for the whole treatment unit: a cholera treatment center is sited away from water sources and away from facilities that stay in daily use, such as schools, markets, and dispensaries, so an outbreak site does not sit on top of the places people still need to visit for other reasons. Choosing the location itself is a balancing act — a site has to stay reachable for people who are sick and moving slowly, while also staying far enough from water and crowded facilities that the treatment unit doesn’t create a second point of contamination for the community it’s meant to serve.
Layout as Infection Control, Not Just Floor Plan
None of this is decoration. The one-meter cot gap, the contaminated/clean zone split, the one-way patient flow, and the distance rules around latrines and water sources are all the same intervention applied at different scales: keep contaminated material away from people, water, and surfaces before it has a chance to spread. A cholera treatment unit that gets the cot count right but ignores the spacing, or that has enough beds but no clean zone for staff to retreat to, is solving the wrong problem. The layout is the intervention as much as the rehydration fluids are — and for teams designing or auditing a field site, the cot spacing is usually the first and easiest thing to check.
That also makes it a useful first check for anyone reviewing a site plan rather than walking the ground in person. A floor plan that shows cot rows without a measured gap, or that routes a single corridor through both the admission ward and the recovery area, is flagging the same problem a site visit would catch: the design hasn’t separated contaminated movement from clean movement yet. Getting the spacing and the zoning right on paper, before canvas goes up, is far cheaper than re-laying a site once patients are already inside it.