That's an interesting thought I never considered and it opens a can of worms in my mind. Would like to have a scientific answer to that, which I can't do. Just applying some basic deduction from my very limited understanding, I thought of some further questions. My wife first wondered "Do cows get Covid". As I understand tissue valves, I believe the tissue used is made "inert" so it's not recognized as a foreign body that our immune system can attack. So my question would be, "Can bacterial or viral flora, which is commonly in our bodies on a daily basis, recognize valve tissue as infectable? Bacteria and virus can't infect a table top.
So I have more questions for my valve doc....

I found this interesting comment from a top doctor at the Cleveland clinic concerning artificial heart valves and covid...It helped put my mind at ease, but always contact your cardiologist if you think you have been exposed
https://www.heart-valve-surgery.com/coronavirus-covid-19.php