Etiology:  Psorergates simplex is the mange mite of mice.

Incidence:  The incidence of infection with Psorergates simplex is rare.

Transmission:  Transmission occurs by direct contact.

Distribution:  Psorergates simplex mites are distributed on all parts of the body, although they may be most numerous over the head and neck. These mites invade the hair follicles.

Clinical signs:  Clinical signs include multiple small white nodules (dermal pouches) with occasional scab formation.

Diagnosis: Diagnosis can be made by performing skin scrapings of affected areas. Mites may also be expressed from dermal pouches. All life stages may be found in one nodule.