Maybe one way was contaminated testing swabs? Did any one else see the nurse on Fox (unbelievably, her last name was Merck) who apparently got the virus and "recovered," only to test positive again after a swab test ? Are we even sure this virus acts alone? An anon provided interesting information about possible Chinese research showing the virus attacked in association with a bacteria? Bacterial spores could remain viable for a long time, I believe.
Cytokine storm (abnormal immune response, when the immune system "overreacts" due to damage, as I understand it) will produce clots. I'm thinking I don't want to get to that stage, though your comment about serrapeptase is interesting.