A truly interesting bit of science reportage. Outstanding citations and exegeses lend depth and breadth. The Author does a fine job of laying out the information available and the scientific speculation thereupon. The included references are exceedingly helpful and welcome. I took the time to download and lightly scan some of them which provided additional elucidation on the matter at hand. The more intellectually inquisitive may wish to do the same. Lastly, the subject is a valuable addendum to the body of knowledge being accumulated about the pandemic. Prospective readers will come away well-informed. Five stars!