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Will try to find proper citation for nervous system hypothesis.
But anosmia cited by ENT UK:
https://www.entuk.org/categories/covid-19
https://www.encephalitis.info/blog/coronavirusand patient confirmed with virus in cerebrospinal fluid cited by encephalitis soc:
https://www.encephalitis.info/blog/coronavirus
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It'll be interesting to see where anosmia sits on the timeline though.
The first link even specifically mentions it in the post-infectious phase for other viruses like the common cold. I think it will be quite different to the precursor symptoms like the dry cough or shortness of breath, but obviously still worth isolating if only because it's unknown whether someone with anosmia could infect others and for how long.
Any links please.. to Science :)