These are tiny mites that burrow into the skin and lay eggs. The infection is spread by close physical contact or bedding which the mites can live in for 1-2 days.
Time between exposure and illness (incubation period): 2-4 weeks (or 1-2 days in those who have previously been infected).
Later red lumps may appear on the limbs and trunk.
Notify your school or day care centre. Generally your child is no longer infectious after 24 hours of treatment, but in some cases a further treatment is necessary in 2 weeks time.
Chapter 4 Your Child's Health