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Vol.
XXIV
No.
04
Year
2026
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Outbreak Response · Field Ops

Mobile Isolation Units & Cholera Cots

Global Health Equipment Review·Field Series·Evidence Desk·Peer-reviewed in spirit · Educational

An editorial field guide to the structures and beds that turn a confirmed outbreak into a managed one — graded by deployment speed, decontaminability, and the fluid-management reality of a cholera treatment centre, not by catalogue specification.

Read the assessmentBack to Outbreak Response
Plate II
Fig. — field plate
Figure. Engraved reference plate — evaluating equipment on field resilience, not lab-bench ideals.
Why the structure follows the patient flow

A cholera treatment centre is a one-way circuit

Mobile isolation capacity is not a tent — it is a flow. A cholera treatment centre (CTC) is organised as a one-directional circuit that moves a patient from a screening and triage point, through a rehydration ward, to recovery and discharge, without ever crossing a clean corridor back over a contaminated one. The structure earns its grade on whether it makes that circuit physically obvious to a tired night-shift team, not on its photographed footprint.

The same logic governs every isolation system we assess, from a modular treatment-centre shell to a negative-pressure tent for an aerosol-capable pathogen. The decisive questions are mundane and unforgiving: can an untrained crew raise it before the case count peaks, does the floor drain toward a chlorinated excreta pit rather than toward the next ward, and do its surfaces survive repeated 0.5% chlorine wash without the seams letting go? Containment is a property of the layout first and the fabric second.

Review criteriaBy which we judge field gear
01Criterion
20 cm
Central stool aperture for an adult cholera cot (10 cm for children)
02Criterion
≤70 cm
Cot height ceiling — higher risks excreta splashing during collection
03Criterion
2 buckets
Per patient: one calibrated for stool output, one for vomit
04Criterion
500–1000 mL/hr
ORS maintenance rate a rehydration ward must be plumbed to sustain
Standards of the desk
Plate II
Fig. — field plate
Figure. Engraved reference plate — evaluating equipment on field resilience, not lab-bench ideals.
The bed is a measuring instrument

Why a cholera cot is not an ordinary cot

The purpose-built cholera cot looks crude and is, in fact, a precision device. It is a washable, waterproof frame fitted with a plastic sheet pierced by a central hole — 20 cm for adults, 10 cm for children — positioned over a calibrated bucket so that ongoing stool loss can be measured rather than estimated. In a disease where an adult can lose litres of fluid an hour, that measurement is the clinical basis for the entire rehydration plan; replacing losses you cannot see is guesswork.

The design constraints follow directly. The bed must sit high enough to seat a collection bucket beneath the aperture but no higher than about 70 cm, above which excreta splashes during collection. Its surfaces must be non-porous and survive repeated chlorine disinfection between patients; where proper cots are unavailable, mats may substitute but must be incinerated after each patient because they cannot be washed. We grade cots on aperture placement, frame stability under a dehydrated adult, splash geometry, and how the surface holds up across a decontamination cycle.

See the full outbreak field-kit logic
Our field-equipment review method

How to evaluate a mobile isolation system for the field

Assessed in the order a logistician would actually walk the site, from circuit to consumable.

  1. 01Step

    1 · Map the one-way circuit before the structure

    Confirm the system can be laid out as a directional flow — screening, suspect ward, confirmed ward, recovery, discharge — with separate clean and contaminated corridors and hand-washing points at every threshold. A structure that forces staff or patients to backtrack across a contaminated zone fails containment regardless of its barrier rating.

  2. 02Step

    2 · Time the deployment with an untrained crew

    Outbreaks move faster than specialist teams arrive. Grade set-up time assuming a non-specialist local crew with the supplied instructions only. A modular shell or tent that demands a trained rigging team is a structure that arrives after the peak. Re-erectability matters too: many units are relocated mid-outbreak.

  3. 03Step

    3 · Verify drainage and the excreta pathway

    The floor must slope toward a chlorinated drainage point and excreta pit, away from wards and any water source. For cholera in particular, the waste pathway is the containment story — an isolation tent that cannot manage high-volume fluid loss and its safe disposal simply concentrates the hazard indoors.

  4. 04Step

    4 · Test surfaces against the decontamination regimen

    Outbreak structures live on repeated 0.5% chlorine wash. Assess how floors, seams, viewing panels, zips, and frame joints hold up across cycles — chlorine embrittlement at the seams is the failure point that ends a unit's life long before its warranty does.

  5. 05Step

    5 · Size beds, buckets, and ORS distribution to surge

    Plan one cholera cot or chair plus two buckets per patient, infusion stands or tie-ropes above the beds, and an ORS dispensing container with a tap and catch-bucket per ward. Then size for surge: a treatment centre can scale from twenty to two hundred beds overnight, so the consumable flow, not the initial pack, is what you are really procuring.

  6. 06Step

    6 · Confirm storability after the outbreak

    Field-credible units knock down, clean, and store for the next event. A structure or cot that cannot be disinfected and packed away becomes single-use waste — an avoidable cost in a system that will face the next outbreak with the same budget.

Method of review
ArticleField Series

Why the crude-looking cot is a mortality intervention

It is easy to underrate a cholera cot precisely because it looks primitive. The mortality data corrects that instinct. Severe cholera left untreated carries a case-fatality rate of roughly 30 to 50 percent; with prompt and adequate rehydration that figure falls below one percent. The decisive variable in delivering that collapse is accurate fluid replacement — and you cannot replace losses you cannot measure. The cot's central aperture over a calibrated bucket is what turns an estimated stool output into a measured one, which is the clinical basis for the entire rehydration plan in a disease where an adult can lose litres an hour.

The structure around the cot matters just as much. A treatment centre laid out as a clean one-way circuit, with separated corridors and chlorinated drainage away from the wards, is what keeps the under-one-percent figure from being undone by cross-contamination. And the supply picture is fragile: in 2024 the global oral-cholera-vaccine stockpile ran empty, with requests for 8.4 million doses over six weeks only partly met, which means treatment infrastructure — cots, fluids, and circuit design — is carrying more of the response burden, not less. We grade these structures on aperture geometry, drainage, deployment speed, and decontaminability because those properties are, quite literally, where the mortality curve is bent.

End of section
From the review desk

The systems we assess

Isolation and treatment infrastructure is not one category. Each class fails differently under field load, so each is graded on its own terms.

  1. 01

    Cholera cots & pierced chairs

    Calibrated stool-output cots for infused or overnight patients; pierced chairs for stable, cooperative oral-rehydration cases at oral rehydration points. Graded on aperture geometry, splash height, frame stability, and disinfectable surfaces.

    Field kit composition
  2. 02

    Modular treatment-centre shells

    Tent-based or frame structures that house screening, wards, and recovery as one directional circuit. Graded on set-up time with an untrained crew, drainage design, and whether the shell survives a second relocation.

    The grading lens
  3. 03

    Negative-pressure & transport isolators

    For aerosol-capable, high-consequence pathogens: negative-pressure tents and patient transport isolators where airflow integrity, not just a barrier, defines containment. Graded on airflow targets, seal durability, and crew-set-up time.

    Matching PPE
  4. 04

    Decontamination & waste circuit

    Hand-washing stations at every threshold, chlorine preparation and sprayers, calibrated buckets, and a sealed excreta pathway to a lined pit. The waste circuit is part of the isolation system, not an accessory to it.

    Sanitation supplies
Correspondence

Queries to the desk

05 entries on file
Q1.What makes a cholera cot different from an ordinary camp bed?

A cholera cot is a measuring instrument. It carries a central aperture — about 20 cm for adults, 10 cm for children — over a calibrated bucket so that ongoing stool loss can be quantified rather than estimated, which is the clinical basis for replacing fluids accurately. Its surfaces are waterproof and non-porous so they survive repeated chlorine disinfection between patients. An ordinary cot offers neither the output measurement nor the decontamination tolerance, both of which are central to cholera management.

Q2.How high should a cholera cot be, and why does it matter?

High enough to seat a collection bucket beneath the aperture, but no higher than roughly 70 cm. Above that, excreta splashes during collection — a contamination and dignity problem in equal measure. The height is a genuine design constraint, not a comfort preference, and we grade it explicitly.

Q3.What is the single most important property of a mobile isolation unit?

That it can be deployed as a one-way circuit by a non-specialist crew before the case count peaks. Containment is a property of the layout — directional flow, separated clean and contaminated corridors, drainage away from wards — long before it is a property of the fabric. A structurally excellent shell that an untrained team cannot raise quickly, or that cannot be re-erected after relocation, arrives too late to matter.

Q4.How do you grade these structures against chlorine decontamination?

Outbreak structures and cots live on repeated 0.5% chlorine wash, and chlorine embrittlement at the seams, zips, and frame joints is the recurring failure point. We weight how surfaces and junctions hold up across decontamination cycles, because that — not the initial barrier or strength rating — is what determines whether a unit survives one outbreak or several.

Q5.Does this guide endorse specific products or manufacturers?

No. This is editorial field-equipment judgment anchored to published WHO and MSF cholera and isolation guidance and to what holds up when a unit is actually unpacked and raised in the field. We assess system categories and the design properties that matter — aperture geometry, drainage, deployment speed, decontaminability — without naming products, quoting prices, or reproducing manufacturer claims as fact.

From the editorial desk

Equipment graded for the field, not the catalog.

Have deployment data from a cholera treatment centre, an isolation system to compare, or field experience that sharpens this guide? The editorial desk reviews outbreak-response submissions from clinicians and logisticians.

Contact the editorial desk