Scabies infestation is caused by the mite Sarcoptes scabiei
. Transmission is by skin-to-skin contact. Mites burrow into the skin where they lay eggs. The offspring crawl out onto the skin, and make new burrows.
The incubation period is 2-6 weeks before the onset of itching in people without previous exposure, 1-4 days after re- exposure. The period of communicability is until the mites and eggs are destroyed by treatment. Contact infectivity is high.