IMO, it had nothing to do with the silver. Sorry for anyone who swears by it but it is modern day "snake oil".
Bumping up the temps and such was probably enough for him to fight the infection down. But the issue is also that it may have allievated the symptoms, but not eliminated the virus. So he'll rally for a while, then come down with it again. But having knocked the symptoms down means you won't notice until it's worse.
He could have thrown the virus off himself, and be fine. But it's common for snakes to look better then go downhill again, because there was nothing that killed the actual cause. It's sort of like draining the infection from a embedded splinter. It feels better and looks more healed up. But unless you remove the splinter, the underlying cause is still inside and may indeed flare up again and again.
Good luck with him and I'd definitely watch him closely and I hope for your other animals' sake that you have him in a quarentine area.
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