Hi all. A different neuroscientist got back today with his take on this.
Dear Frances
I am happy for this reply to be posted if it Is helpful. First of all, I am not a clinician nor a virologist so I would hope that people will take my replies with a pinch of salt. I have been reading much of the lieterature on COVID both in the newspapers and in the major medical journals and we are starting a research project on the human genetics of covid infection and response (details at the end).
I think you are right and it is clear that many people have unusual and longlasting symptoms of and after covid infection. I think it is clear that the infection induces and autoimmune response in those infected and this autoimmunity persists after the virus is “defeated”. A clue to this is the few children who get a serious effect of the disease get a sydrome called Kawasaki disease
https://en.wikipedia.org/wiki/Kawasaki_diseasee_
Which is almost certainly an autoimmune vasculitis. Vasculitis means an attack on the tissues of the blood vessels. And this perhaps partly explains why the symptoms are so variable: all your tissues have blood vessels. There are other weird versions of the disease too which are like chilblains
https://www.practiceupdate.com/content/chilblain-like-lesions-on-feet-and-hands-during-the-covid-19-pandemic/997722_
These are swellings of the blood vessels in the feet…..
So I think the variability in the disease in part depends on which blood vessels are being attacked by your own immune system after the virus has been defeated (or at least during that fight between the virus and your immune system).
Why does this happen? That is not known, but to get into your body the virus binds to a protein called ACE2 and this protein pulls the virus into your cells. ACE2 helps control blood pressure and is found in your blood vessels and that might be the reason. I also think it is possible that your route of infection influences your symptoms… lungs..breathed in…. mouth/nose… smell and taste… gut…in your food etc. This is not known, this is just my opinion.
Of note, the just announced drug for covid treatment, dexamethasone is a powerful immune suppressant so its welcome success in reducing mortality fits with these ideas.
We are part of a UK wide stdy to try and understand the human genetics of the disease… why do some catch it and some not and why do some do badly and others recover quickly and completely. The more people we recruit the more complete will our picture be. This is the registration form
https://register.genomicsengland.co.uk/s/covid-19-registrationn_
We will beat this disease!!
I hope this email is helpful and if it is useful I can forward good articles to you for your group