My experience with ri is if i think any of my snakes got it, i take em to the vet and treat it with anti biotics . Is your snake wheezing or just hissing?
I checked the recent shed, and there was a big build up on the nostril area... so i have suspicions that it was it's shed and not an RI! So right now I have been keeping a close eye (and ear) on him, no weird sound since he shed... so I have my fingers crossed!!!