The Measles Case in a Shelter
A 200-bed emergency shelter opened 5 days ago after a hurricane. This morning a 4-year-old presents to the on-site medical tent with fever of 39.2°C, cough, coryza, and a maculopapular rash that started on the face and is spreading downward. The child has no vaccination record. The shelter is a converted gymnasium with bunk beds 3 feet apart, shared bathrooms, and a single large sleeping hall. Two other children in the same aisle have fever and cough. The local health department is reachable by phone but has no on-site presence. The shelter has no isolation room, one nurse, and no ability to test on site.
1. What is your working diagnosis and immediate infection-control actions? Be specific about the constraints of a gymnasium shelter.
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Working diagnosis: measles (rubeola) - fever, cough, coryza, and a descending maculopapular rash in an unvaccinated child, with two epidemiologically linked cases in the same aisle.
Immediate actions:
- Isolate the child now - a separate room or a curtained-off area with a dedicated bathroom if possible; if not, a designated corner with a mask on the child and a 6-foot buffer, and no shared toys or bedding.
- Airborne precautions for anyone entering - N95 respirators for staff, and limit the number of people who enter. Measles is airborne and highly contagious; a gymnasium with 3-foot bunk spacing is a transmission amplifier.
- Identify and quarantine exposed contacts - the two febrile children in the aisle and anyone who shared the bathroom or sleeping area. Check vaccination status of all shelter residents and staff.
- Notify the health department immediately - they direct post-exposure prophylaxis (MMR within 72 hours or immunoglobulin within 6 days for susceptible high-risk contacts), testing, and reporting.
- Vaccinate susceptibles - offer MMR to unvaccinated residents and staff who have no evidence of immunity, coordinated with the health department.
- Cohort and monitor - daily fever/rash checks for the shelter population for the incubation period (7–21 days).
2. The shelter has no isolation room and 200 residents. How do you operationalize isolation and cohorting, and what do you tell the shelter manager about the next 2 weeks?
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Operationalizing isolation with no dedicated room:
- Create a cohort area - partition off a section of the gym with sheeting or curtains, dedicate a bathroom, and post signage. Assign one nurse and one aide to that area only.
- Cohort the cases together - the confirmed child and the two febrile aisle-mates go into the cohort area; do not mix with well residents.
- Separate the well - move unexposed residents to the far end of the hall, increase spacing where possible, and stop shared bedding and toys.
- Staff assignment - cohort staff do not rotate into the well area; PPE and hand hygiene at the boundary.
- Transfer option - if the health department can arrange a medical respite or isolation facility, move the cases there; a gymnasium is not a long-term isolation setting.
What to tell the manager about the next 2 weeks:
- Expect more cases; the incubation period is up to 21 days, so daily symptom checks and a low threshold for isolation are essential.
- Vaccination of susceptibles is the main lever; coordinate a vaccination clinic with the health department.
- Do not discharge residents to crowded settings without checking immunity.
- Document exposures and cases for the health department and for the after-action review.
- Plan for the possibility that the shelter must stop accepting new admissions until the outbreak is controlled.