Fever and rash in a child returning from travel
A 3-year-old boy is brought to a polyclinic with 4 days of fever to 39.5 °C, cough, coryza, and red eyes, followed today by a rash starting behind the ears and on the face. He returned 11 days ago from a country with low measles vaccination coverage. He has had one dose of MMR at 12 months; the second dose is scheduled at 6 years. His 8-month-old sister is at home and has not been vaccinated. The clinic waiting room is full. The mother asks whether the rash is 'just an allergy' and whether the sister can stay at home.
1. What is the working diagnosis and immediate infection-control action in the clinic?
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Working diagnosis: measles is the leading diagnosis - fever plus cough, coryza, conjunctivitis, and a descending rash with a compatible travel history and incomplete vaccination. The differential includes rubella, roseola, scarlet fever, and drug eruption, but the exposure and clinical picture make measles the priority until proven otherwise. Immediate action:
- Isolate before examination - place the child in a separate room or, if unavailable, a mask for the child and staff, and move him out of the shared waiting area. Measles is airborne; the waiting room exposure is the main risk.
- Notify the infection-control team and public health authority promptly (measles is a notifiable disease).
- Collect a sample - throat/nasopharyngeal swab and serum for measles IgM, and urine if indicated, before any immunoglobulin is given.
- Supportive care - antipyretics, fluids, vitamin A where indicated, and review for complications (pneumonia, otitis, encephalitis). Do not send the child home without arranging follow-up and without tracing exposed contacts.
2. How should the household contacts, especially the 8-month-old sister, be managed, and what does the single MMR dose mean for the older child?
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Contact management:
- The 8-month-old sister is too young for routine MMR but can receive MMR within 72 h of exposure, or immunoglobulin within 6 days if MMR is contraindicated or the window for vaccine has passed. Either way she needs monitoring for fever and rash for 21 days and should be kept away from other young children.
- Other household contacts without documented immunity should be vaccinated within 72 h or given immunoglobulin. Pregnant women and immunocompromised contacts need urgent assessment.
- Exclusion: unvaccinated contacts should be excluded from childcare and school for the incubation period (up to 21 days from exposure), per local public health rules. The older child's single dose: one MMR dose gives good but incomplete protection; the second dose is not a booster but catches primary vaccine failures. A child with only one dose is not considered fully protected, which is why the travel history matters. After recovery, ensure the second dose is given at the scheduled age and check the whole family's vaccination status.