No feeding from humans for a year, under threat of social exile. If he can't be trusted to check his prey's condition, he has no right at all to take from them. The hospital can supply him - and if supplies are scarce, he goes hungry.

[ He thinks. Honestly his first instinct had been that the vampire responsible should have had his fangs filed down. It's still a tempting suggestion, but being listened to is calming him down. ]

Or ridicule. Vampires are proud fuckers. Tell the whole community how careless he was, how close he came to getting all of them caught. Make him a laughing stock, and make it clear that anyone who speaks with him will be a laughing stock as well.