I am very much aware of hyperactivity of the blood clotting system in covid-19 and resulting complications on many organs. I have referred to a paper above. Hypercoagulability is a complication found in many patients in ITU after major surgery because the coagulation system is often activated in inflammatory and traumatic conditions. In fact heparin and other blood thinning agents are now routinely used in these settings and also after heart attacks and stokes. What I meant to say is that the effects of covid-19 other than on the respiratory tract, are mainly secondary to these events and I do not think the virus attacks the heart or the brain or the kidneys directly. Covid-19 at its worst is bad enough and we do not need to be alarmist about its potential mass effect on intellect, fertility or the heart and kidneys. I have not looked but if you have references please post.