Microbiology of Scabies

Etiology and Causative Agent

Scabies is a contagious skin infestation caused by the Sarcoptes scabiei var. hominis, a microscopic mite that burrows into the epidermis. The primary mode of transmission is direct skin-to-skin contact.

Microbial Characteristics

• Taxonomy: Belongs to the phylum Arthropoda, class Arachnida.
• Life Cycle: Includes egg, larva, nymph, and adult stages.
• Pathogenesis: Mites penetrate the skin and trigger a host immune response, leading to intense pruritus.

Clinical Manifestations

Symptoms of scabies include severe itching, especially at night, and the appearance of burrow tracks in intertriginous areas such as wrists, elbows, and between fingers.

Diagnosis

Scabies is diagnosed through clinical examination, dermoscopy, and microscopic visualization of mites or eggs in skin scrapings.

Treatment

First-line treatments include topical permethrin and oral ivermectin. Proper hygiene and washing of clothing and bedding are essential for eradication.