This was what seemed like a pretty informed comment from on3 BWI talking about exactly this:
"My dad is a post-op lung transplant coordinator for a hospital up in MA. From what he’s told me, the first year is filled with ups and downs. Rejection of the transplant is not uncommon, but it’s just one of many fluctuations that can/may happen. Ben’s got a long road ahead of him so don’t be surprised if there are periodic stories of complications. As my dad puts it: He’s a tortoise training for a marathon. His transplant coordinator will be following him the rest of his life to check in and monitor everything. Don’t be surprised if you see Ben at less tournaments and/or wearing a mask in public. He’s going to have to be extra careful about what germs and such he’s exposed to from here on out."