The disgusting reason you must wash your sheets at 60 degrees Centigrade - Demodex mites survive washing at lower temperature

Demodex mite
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https://inews.co.uk/news/science/disgusting-reason-you-must-wash-sheets-60c-3720779
Demodex blepharitis is caused by dust mites that infest the eyelash follicles, where they cause damage via mechanical, chemical, and bacterial mechanisms.
Mite infestation contributes to the formation of cylindrical, sleeve-like coatings at the base of the eyelashes. These collarettes are composed of partially digested epithelial cells, mite waste (faeces), and eggs. The cylinders at the base of the eyelashes are considered to be the diagnostic sign of Demodex blepharitis.
It is becoming commoner due to people doing low temperature washing and also we are an ageing population.
Contact lens wearers are especially at risk of increased Demodex infestation and Demodex has been shown to be a reason for having to stop contact lens wearing.

Mite infestation results in the formation of cylindrical, sleeve-like coatings at the base of the eyelashes. These collarettes are composed of partially digested epithelial cells, mite waste (faeces), and eggs. The cylinders at the base of the eyelashes are considered to be the diagnostic sign of Demodex blepharitis.