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Roseola (Three-Day Fever)

Roseola follows a classic pattern that almost every child goes through once: 3-4 days of high fever — and then, when the fever suddenly drops, a red rash appears. Only then is the diagnosis clear. Roseola is harmless, but the high fever can be very unsettling for parents.

Posibles Causas

  • 1Human herpesvirus 6 (HHV-6) — most common pathogen (about 90%)
  • 2Human herpesvirus 7 (HHV-7) — rarer, similar course
  • 3Transmission via droplet infection (saliva, sneezing)
  • 4Incubation period 5-15 days
  • 5One-time infection — lifelong immunity afterwards

Qué Puedes Hacer

  • Reduce fever: paracetamol or ibuprofen (age-appropriate) — dose by weight
  • Plenty of fluids: breastfeed more often, offer water or diluted teas
  • Light clothing and cool room (18-20°C)
  • Cool compresses only from 39°C and only when extremities are warm
  • Lots of body contact and comfort — your baby needs you especially now

¿Cuándo Consultar al Médico?

  • Febrile seizure: twitching, fixed gaze, loss of consciousness → place child safely, do NOT restrain, call 911/112
  • Fever above 40.5°C not responding to medication
  • Baby under 3 months with high fever → ALWAYS see doctor immediately
  • Child stops drinking and shows signs of dehydration
  • Rash is very itchy or blistering (then it's probably NOT roseola)

Notas Según la Edad

Most common between 6 months and 2 years (peak around 9-12 months). Before 6 months rare (maternal antibody protection). By age 3, over 95% of all children have had the infection. Adults are almost always immune. Roseola is the most common cause of febrile seizures in toddlers — so monitor temperature closely.

Preguntas Frecuentes

How do I recognise roseola?
The typical pattern: FIRST 3-4 days of high fever (often 39-40°C) with no other clear symptoms. The child is surprisingly well for such a high fever. THEN the fever drops suddenly and a pale red, non-itchy rash appears (trunk, face, arms). The rash disappears after 1-3 days.
Is the rash contagious?
No! When the rash appears, the contagious phase is OVER. The child is most contagious during the fever phase, before you even know what it is. That's the tricky part about roseola.
Should I worry about febrile seizures?
Febrile seizures occur in about 10-15% of children with roseola. They look terrifying but are usually HARMLESS and leave no lasting damage. During a seizure: place the child safely on their side, put nothing in their mouth, time the duration, call an ambulance. Always get medical evaluation afterwards.

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Este artículo es solo informativo. No reemplaza el asesoramiento médico individual. Si tienes preocupaciones, contacta a tu pediatra, matrona o llama a urgencias.