Demodex folliculorum

Introduction

Demodex folliculorum are commensal mites that live in human hair follicles. D. folliculorum and D. Brevis are the only species in the Demodex genus that are found on humans, and are both referred to as “eyelash mites”. While D. brevis inhabit the sebaceous glands of hair follicles, D. folliculorum inhabits hair follicles themselves, particularly of eyelashes and eyebrows. Infants will acquire D. folliculorum shortly after birth from contact with other human hosts, however the lack of sebum production in young children prevents D. folliculorum from colonizing efficiently. As humans reach adulthood and continue to age, the infestation of D. folliculorum increases. The elderly and those suffering from immunodeficiency are particularly vulnerable to severe infestation and health risks posed by D. folliculorum including blepharitis. .

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Colony of Marburg virus. Transmission electron microscope image taken by Dr. Tom Geisbert https://www.sciencedirect.com/science/article/pii/S0738081X14000467.

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Edited by Scarlett Jones, student of Joan Slonczewski for BIOL 116 Information in Living Systems, 2019, Kenyon College.