While the update sound great I would still take the animal to a vet http://arav.allenpress.com/arav/findavet and get a culture, chances are the RI may still be present.
The first issue is that the previous owner was prescribed an oral anti-biotics which has little to no effect.
Treating a RI not only needs to be done by a QUALIFIED herp vet but treatment needs do be done for the right length (usually several weeks) and using the right antibiotic.
Now since it is a recurring or probably a RI that never fully went away (treatment probably only alleviated the symptoms)
While I agreed that F10 should be used while waiting to be seen by a vet, a vet definitely needs to be seen based on symptoms and the fact that this is either a recurring problem or one that has been ongoing for quite some time.
I will have disagree with this advice.
First no animal should receive an antibiotic treatment without being properly diagnosed.Tylan is an antibiotic that is available OTC for use in cattle or something like that, but you can get it without a prescription. I think I may have heard of at least one other antibiotic that is available OTC that might be useful in treating RIs, but I can't remember which one right now.
Second recommending a specific antibiotic without proper diagnoses is just bad advice , the first thing a vet will do is a culture, there are different type of RI and obviously finding the right antibiotic is a must.
Tylan is not a miracle cure.
Tylan is mainly effective against gram positive bacteria and at this point it is not known if the RI is due to gram positive bacteria.