Just so you know, "the other side of the room" is NOT adequate for quarantine, which I highly recommend you do. Your new snakes can bring diseases & parasites to your other snakes, & vice versa. And your sick snakes (with RI's) would be better if kept away from all the others- RI's can be contagious, & if you're not washing hands thoroughly between handling them, you too can be a vector (spreading the germs), same goes for feeding tongs or anything else used in common.
The best plan is PREVENTION- keeping the correct temps. & humidity, keeping enclosures clean (& using proper disinfectants on them), not stressing snakes by excessive handling (especially when new- they need time to settle in- stress is just as bad for their immune system as it is for ours), & quarantining ALL new snakes from the others, every time. When you keep adding new snakes to a room with sick ones, it's a recipe for disaster. Also, some sources for snakes are far better than others- so do your homework, don't buy from just anyone- get references, & learn how to tell a healthy snake before you buy them.
Make sure the vet you see is experienced with snakes. https://arav.site-ym.com/search/custom.asp?id=3661 Antibiotics are only effective if the right medicine is chosen for the infection, & lab work is needed to do that.