Incubation period:
Between 1 and 3 weeks
Infectious period:
The most infectious time is 1-2 days before the rash appears, but it continues to be infectious until all the blisters have crusted over.
Symptoms:
- It starts with feeling unwell, a rash and a slight temperature.
- Spots develop, which are red and become fluid-filled blisters within a day or two. They eventually dry into scabs, which drop off. The spots appear first on the chest, back, head or neck, then spread. They don’t leave scars unless they're badly infected.
