It appears your snake has one of those "superbugs", bacteria that have developed resistance to most of the antibiotics available to us. Baytril (enrofloxacin) is NOT effective against this organism, but may prevent other opportunistic bacteria from causing problems in this sick snake. The only antibiotic tested that is at all effective appears to be acid amoxicillin(clavamox or augmentin, I guess). I don't know if you can give this to a snake, perhaps orally with a feeding tube. Honestly, I would keep these snakes in strict quarrantine for the foreseeable future, with perfect husbandry. I would not introduce these snakes to any other snake, or keep them in the same rack, until you have had atleast one negative culture. These super resistant bacteria are BAD NEWS.