The humidity is the problem.......put a SMALL amount of water for the snake to drink.....the high temps are to dry up the mucous, as the snake can't cough it up. If the humidity is too high, the secretions increase and the snake will drown in it's own fluid. I have cured many babies with just high temps/low humidity, as babies cannot handle antibiotics. Good Luck!
Actually low humidity can cause an RI and or make it worse/take longer to go away. The main cause for RI in BP's is temps too low and not enough humidity.