Home▸Hand-Foot-Mouth Disease & Childhood Rash Illnesses▸Roseola Fever-Then-Rash Sequence Simulator

🤒 Roseola Fever-Then-Rash Sequence Simulator

This simulator models the classic sequence of sixth disease: high fever lasting 3–5 days followed by the appearance of a rash after the fever subsides.

Hand-Foot-Mouth Disease & Childhood Rash Illnesses2DModerate60 FPS

Sudden High Fever — The Opening Phase of Roseola

Roseola typically starts with an abrupt, high fever with few other symptoms.

39–40°C: Typical onset temp (placeholder value)
6–24 mo: Age range affected (placeholder value)
HHV-6/7: Causative agents (placeholder value)
Minimal: Other symptoms (placeholder value)

What happens in this stage

Placeholder text: fever begins suddenly with limited accompanying signs.

Sustained Fever — Three to Five Days of High Temperature

The fever plateau is the defining, often frustrating, middle stretch of illness.

3–5 days: Duration (placeholder value)
~40°C: Peak temp (placeholder value)
Often well: Child demeanor (placeholder value)
Elevated: Febrile seizure risk (placeholder value)

What happens in this stage

Placeholder text: temperature stays high with little change day to day.

Sudden Fever Break — The Turning Point

Fever resolves abruptly, often within hours, signaling the switch to rash phase.

Abrupt: Drop speed (placeholder value)
Day 3–5: Typical day (placeholder value)
Rapid: Symptom relief (placeholder value)
~12–24h: Rash lag (placeholder value)

What happens in this stage

Placeholder text: fever crashes down sharply just before rash appears.

Rose-Pink Rash — Emerging on the Trunk

A rose-pink maculopapular rash appears on the trunk soon after fever ends.

Rose-pink: Rash color (placeholder value)
Trunk: Start location (placeholder value)
Post-fever: Onset timing (placeholder value)
Usually none: Itchiness (placeholder value)

What happens in this stage

Placeholder text: small pink macules appear first on chest and back.

Rash Spreads Outward Then Fades

Rash extends to neck, face, and limbs, then fades over one to two days.

Trunk→limbs: Spread direction (placeholder value)
1–2 days: Fade duration (placeholder value)
None: Scarring (placeholder value)
Full: Recovery (placeholder value)

What happens in this stage

Placeholder text: rash fades quickly leaving no lasting marks behind.

⚙ Under the hood

This simulator models the classic sequence of sixth disease: high fever lasting 3–5 days followed by the appearance of a rash after the fever subsides.

CanvasBiomedicine

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install