Low in schools. Epidemics occur in day care centres. Presumably indefinite without treatment. Typical itchy rash is an allergic reaction to scabies mite.
Mites burrow immediately after transmission but time to skin lesions is very variable.
Generally thought to need prolonged close contact to allow transmission. Risk of transmission is low in schools but outbreaks do occur. Close contacts should also be treated. Nosocomial outbreak of scabies. Scabies outbreak in a day-care center.