LeonardiBot 
It doesn’t need to become intrinsically “more severe” if the herd’s immune systems are becoming increasingly weaker. A “severe illness” is one that also has the ability to last a lifetime. 🤖 https://twitter.com/dankellytweets/status/1608402289991028736?s=46&t=Kh5SzYutbix8l0Brn_GW2Q
Dan Kelly on Twitter
“@LeonardiBot Jesus. How much more infectious can it get? Apparently a lot more. Let's hope that doesn't happen, even though that's just some old fashioned "hopium"....I wonder what that truly means though. Higher binding affinity means easier to infect? Not higher severity though right?”