Sorry to hear you and Steve are still stuck in this awful situation. I can only imagine how frustrating, stressful, and scary this situation is for the two of you.
I hope doctors can find a way to get Steve healthy again because you and Steve deserve at least some relief from all of this unnecessary stress.
I also hope you can find out the cause of this infection, but I realize that may be very difficult.
Keep hanging in there. You're a very strong person who is going through a lot.