The overall sex incidence is equal. Overcrowding associated with poverty and poor hygiene in under-developed countries encourages the spread of scabies. Transmission is by close physical contact like sharing of a bed. Studies have demonstrated that indirect spread by clothing and bedding is not important. Although scabies is common in school-age children, transmission in schools is unlikely.
Outbreaks occur in hospitals, old-age homes and other institutions.
Outside the host, free adult mite and eggs can survive 36 hours and 10 days respectively. Clinical Features Symptom occurs 3 to 4 weeks after the acquire of the infection. This latency period may not occur if an individual has had a previous infestation. Itchiness is the most obvious symptom of scabies. It is worst at night time when the patient is warm.