A recent discovery about Covid-19 changes things.
Until recently, it was assumed that C19 was a pulmonary (lung) virus, thus it was associated with other pulmonary viruses, like influenza and common cold. However, lots of people experienced unusual and uncommon symptoms, which do not have pulmonary, but *vascular* origins.
That is, their symptoms would show up from other vascular viruses, like Herpes Simplex and Measles.
This also explains why it is people *recovering* from C19 are the ones getting this stuff. All these other problems from reddened toes in children, to erectile dysfunction, to opportunistic other infections are associated with damage to the vascular system.
COVID-19 seems to attack wherever it can find a weakness...