Dear Center for Disease Control, NCIRD, Influenza Section,             A month ago, only one version of avian influenza was spreading among cattle in the U.S., H5N1 B3.13. Now two additional versions of avian flu are spreading, H5N1 D1.1 and H5N9. Just as worrying, scientists now believe the virus can be spread via the airborne dust of desiccated waterfowl feces, and perhaps from pet cats to people. But you already know this. What no one can predict is how soon the virus may reassort with seasonal flu or mutate to become easily transmittable between people, which variant will go pandemic, or what the eventual case mortality rate will be.             When SARS-CoV-2 (SARS-2) was first announced in January 2020, because of my 30 years studying viral pandemic disease I instantly knew the broad-spectrum antiviral medicines aspirin and selenium would be effective against Covid-19...