Norman Swan,Cosmos Magazine
It's every paediatrician's nightmare. A child arrives in the Emergency Department with a tall fever, a rash (hasty, incautious) whose spots don't disappear white when you press them under a glass and who turns their head absent from the light. The toddler was well until a few hours before and, or from the parents' story,things are going downhill fast. If you bag the diagnosis wrong, the child could be dead within hours.
Source: realclearscience.com