Quarantine Principles
Part of Sanitation and Hygiene
Quarantine is the oldest and most effective tool for stopping contagious disease from spreading through a settlement. Without antibiotics, antiviral drugs, or vaccines, physical separation of sick individuals from healthy ones is your primary defense. This guide covers when to isolate, how to set up a quarantine area, duration guidelines, contact tracing, safe caregiving, and psychological support.
When to Quarantine
Not every illness requires quarantine. Isolate a person when you observe two or more of the following:
- Fever with respiratory symptoms — coughing, sneezing, difficulty breathing
- Diarrhea or vomiting that appeared suddenly in a previously healthy person
- Rash or skin lesions that spread or appear in clusters
- Multiple people falling ill with the same symptoms within days of each other
- Known exposure to someone already diagnosed or quarantined
The Cluster Rule
A single case of diarrhea may be food poisoning. Three cases in a week is an outbreak. When two or more people develop the same symptoms within 7 days, treat every subsequent case as potentially contagious and isolate immediately.
Symptoms That Suggest Contagion
| Symptom Pattern | Likely Transmission | Urgency |
|---|---|---|
| Fever + cough + body aches | Airborne (droplet) | Isolate within hours |
| Watery diarrhea, sudden onset | Fecal-oral (water/food) | Isolate + check water supply |
| Fever + rash spreading outward | Direct contact / airborne | Isolate immediately |
| Fever + swollen lymph nodes + bite marks | Vector-borne (fleas, ticks) | Isolate + inspect for vectors |
| Jaundice (yellow skin/eyes) + dark urine | Fecal-oral (hepatitis) | Isolate + disinfect water |
| Bloody diarrhea + fever | Fecal-oral (dysentery) | Isolate + boil all water |
Setting Up the Isolation Area
The quarantine zone must be physically separate from the rest of the settlement. Half-measures — a curtain across a shared shelter, a “sick corner” — do not work.
Location Requirements
- Minimum 50 meters from communal areas (sleeping, cooking, water source)
- Downwind from the settlement — prevailing wind should carry air away from healthy people
- Separate water supply or a dedicated container filled from the main source by a designated caregiver
- Separate latrine — at minimum, a dedicated bucket system with a lid, emptied into a pit at least 30 meters from any water source
- Clear boundary — mark the perimeter with rope, stakes, or brush so people do not wander in
Shelter Construction
Build the simplest functional shelter. You need:
- Roof and walls that block rain and wind — tarp, thatch, or existing structure
- Ventilation — open sides or gaps near the roofline. Enclosed, stagnant air increases airborne transmission
- Bedding that can be burned — straw, grass, or leaves. Not your best blankets
- A washstation at the entrance — bucket of water, ash soap, and a cloth for the caregiver to wash hands before leaving
The Two-Bucket System
Place one bucket of clean water with ash soap inside the quarantine shelter for the patient. Place a second bucket outside the entrance for the caregiver. Nobody enters or exits without washing hands. This single practice reduces transmission by an estimated 40-50%.
Duration Guidelines
Without laboratory testing, you must rely on observed incubation and contagion periods. The rule of thumb: quarantine for the incubation period plus one week after symptoms resolve.
Quarantine Duration by Disease Type
| Disease Category | Typical Incubation | Contagious Period | Minimum Quarantine |
|---|---|---|---|
| Respiratory (flu-like) | 1-4 days | While symptomatic + 2 days after fever breaks | 10-14 days after onset |
| Gastrointestinal (cholera, dysentery) | 1-5 days | While symptomatic | Until 48 hours after last diarrhea/vomiting |
| Rash diseases (measles-like) | 7-21 days | 4 days before rash to 4 days after | Until rash fully crusted/healed + 5 days |
| Hemorrhagic (severe bleeding) | 2-21 days | While symptomatic, especially via fluids | 21 days after symptom resolution |
| Unknown illness | Unknown | Assume contagious | 21 days after symptom resolution |
Unknown Diseases Get Maximum Quarantine
If you cannot identify the illness, default to the longest quarantine period. Twenty-one days after the last symptom is the safest guideline. Releasing someone too early can restart an outbreak.
Contact Tracing Basics
Contact tracing answers one question: who else might be infected?
Step-by-Step Process
- Interview the patient. Ask: Who did you eat with in the last 14 days? Who did you sleep near? Who did you share tools, cups, or water with? Who cared for you before isolation?
- Make a list. Write every name. Include people the patient had brief contact with — passing food, working side by side.
- Categorize contacts by risk.
| Contact Level | Definition | Action |
|---|---|---|
| High risk | Shared sleeping space, shared food/water, physical contact (hugging, wound care) | Monitor daily for 14 days. Quarantine at first symptom. |
| Medium risk | Worked alongside, shared a meal but not utensils, conversation within arm’s length | Monitor daily for 14 days. No quarantine unless symptoms develop. |
| Low risk | Brief interaction, passed in camp, no shared food/water | Inform them. Self-monitor. |
- Monitor contacts daily. A designated person checks each high- and medium-risk contact every morning. Ask: any fever, cough, diarrhea, rash? Feel the forehead. Look at the eyes.
- Isolate immediately if any contact develops symptoms.
The Contact Log
Keep a physical record — scratched on bark, charcoal on hide, anything durable. Record: patient name, contact name, type of contact, date of last exposure, daily symptom check results. This log is your outbreak map.
Caring for Quarantined Individuals
The Designated Caregiver Model
Assign one person (ideally two, alternating) to care for quarantined patients. This limits exposure to the fewest people possible. The caregiver should be:
- Someone who has already recovered from the same illness (if applicable — they may have immunity)
- Otherwise, the healthiest and most disciplined person available
- Not someone who prepares food or manages the water supply for the settlement
Caregiver Protocol
- Wash hands with ash soap before entering the quarantine area
- Cover mouth and nose with a cloth — folded at least 4 layers thick, tied behind the head
- Do not touch your face while inside the quarantine zone
- Deliver food and water in dedicated containers that stay inside the quarantine area
- Remove waste (latrine bucket, soiled bedding) using cloth hand coverings
- Wash hands again at the exit washstation
- Change outer clothing if the patient has respiratory or rash symptoms — wash the worn clothing in boiled water
Waste Management
- Feces and vomit: bury in a pit at least 30 cm deep, 30 meters from any water source, covered with soil and a layer of ash
- Soiled bedding: burn if possible. If fuel is scarce, soak in boiling water for 10 minutes, then sun-dry completely
- Eating utensils: wash in boiled water after every use. Do not return to general camp supply until quarantine ends
Ending Quarantine
A person can leave quarantine when all of the following are true:
- No fever for at least 72 consecutive hours (3 full days) without fever-reducing treatment
- No diarrhea or vomiting for at least 48 hours
- Any rash has fully crusted over and is no longer weeping
- The minimum quarantine duration for the disease type has elapsed
- The person feels well enough to resume normal activity
Before re-entering the settlement:
- Bathe thoroughly with ash soap
- Put on clean clothing (not clothing worn during illness)
- Burn or boil all bedding from the quarantine shelter
- Disinfect the shelter — scrub surfaces with ash-water solution, leave open to sun and air for 48 hours before reuse
Psychological Support During Isolation
Quarantine is physically necessary but psychologically brutal. People isolated for weeks can develop anxiety, depression, and paranoia — and may break quarantine out of desperation.
Practical Measures
- Explain the timeline. Uncertainty is worse than a long wait. Tell the person: “You will be here for approximately X days. Here is what we are watching for.”
- Maintain human contact. The caregiver should talk to the patient during visits — not just deliver supplies and leave. Conversation from outside the shelter (shouting distance) from family members helps enormously.
- Provide occupation. Give the patient tasks they can do while confined — mending rope, sorting seeds, carving, weaving. Idle hands and idle minds erode compliance.
- Daily updates. Tell the patient what is happening in the settlement. Being cut off from information breeds fear.
- Honor their sacrifice. Acknowledge publicly that the quarantined person is protecting the group. Stigma (“the sick one”) destroys cooperation; respect (“the one keeping us safe”) preserves it.
Children in Quarantine
A sick child should never be isolated alone. The parent or primary caregiver stays with the child in the quarantine shelter — and is then treated as a high-risk contact upon release. The psychological damage of separating a young child from all caregivers outweighs the infection risk to one additional adult.
Key Takeaways
- Isolate early, isolate completely. A 6-hour delay in quarantine during an outbreak can double the number of infections.
- Separate everything — shelter, water, latrine, utensils, bedding. Shared resources are transmission pathways.
- One or two designated caregivers only. Every additional person entering the quarantine zone is another potential carrier back to camp.
- Track contacts obsessively. The people you miss on your contact list are the ones who start the next wave.
- Default to the longest quarantine period when the disease is unknown. Caution now prevents catastrophe later.
- Support the isolated person’s mental health. A quarantine that drives someone to break out and flee is worse than no quarantine at all.