Something Blue gets an occasional Epsom run

This crossword clue is for the definition: Something Blue gets an occasional Epsom run.
it’s A 43 letters crossword puzzle definition.
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Possible Answers: PORN.

Last seen on: The Guardian – Cryptic Crossword No 28,238 – Sep 14 2020

Random information on the term “PORN”:

Cytomegalovirus retinitis, also known as CMV retinitis, is an inflammation of the retina of the eye that can lead to blindness. Caused by human cytomegalovirus, it occurs predominantly in people whose immune system has been compromised, 15-40% of those with AIDS. There are different types of retinitis, such as retinitis pigmentosa (causes tunnel vision).[medical citation needed]

The symptoms of cytomegalovirus retinitis have it usually starting in one eye (and also have the possibility of retinal detachment), presenting as:

Cytomegalovirus (a type of herpes virus) is what causes cytomegalovirus retinitis. Other types of herpes viruses include herpes simplex viruses and Epstein-Barr virus. Once an individual is infected with these viruses they stay in the body for life. What triggers the virus to reactivate are the following (though CMV can also be congenital).

Human cytomegalovirus (HCMV or CMV) is a DNA virus in the family Herpesviridae known for producing large cells with nuclear and cytoplasmic inclusions, CMV infects around 40% of the population worldwide.

PORN on Wikipedia