Glad you got the rattler.
Moving on, you might want to consider taking it easy with the aerobic exercise. Buried in the corona thread, it sure seems like at least some folks are dying after recovering from the illness, because it may be causing some type of cardiac issue. So you know 7 or 8/10ths for a couple of more weeks might be advisable. Better check with @YVK maybe he can give you a house call...
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It is distinctly possible that I too had covid-19 earlier this year. I went to a big conference in early Jan in Austin with lots of international attendees and spent some time with a number of my colleagues from China. As is predictable when you leave a big conference, you get the crud afterwards. Symptoms kicked off about two days after the conference (five day conference) and I had fatigue, a dry cough, and a very mild fever that waxed and waned for about 5 days, before subsiding and finally going away after another 3 days. At the time I attributed my general feeling of malaise and unwell to a big cedar pollen bloom in Austin at the time. Having lived in Austin for 8 years, I definitely have a cedar pollen allergy, but to be honest it did not feel like hay-fever so much as it felt like an illness.
An anti-body test would be quite interesting. I think a number of us who have traveled through any major airport over the past 120-days have likely been exposed and the number of positive tests that pop-up afterwards will be fascinating.