In reply to Lyndleme:
Covid can definitely affect the nervous system:
https://www.theguardian.com/world/2020/jul/08/warning-of-serious-brain-diso...
Damage to heart, lungs and other organs is also well-documented.
I haven't seen reports of physical damage to muscle tissue, but "long Covid" can involve a post-viral syndrome that looks a lot like ME/chronic fatigue syndrome, with fatigue and muscle pain.
This is a nasty virus and there are a lot of things about it we don't understand yet.