I think mamal biology is similar so i guess respiratory problems are like allergy, cold, flu, chest nfection and pneumonia. Humans seem to get mostly viral colds and flu and arent usually treated but from what ive read rats are more vulnerable and are treated-intivirals, antifungals, antbiotics ect. So I spose its like your baby being ill or your Gran.
http://www.cavyrescue.co.uk/rat-respiratory-guide.shtml
http://www.veterinarypartner.com/Content.plx?P=A&A=1437&S=4&SourceID=62
http://www.cavyrescue.co.uk/rat-respiratory-guide.shtml
http://www.veterinarypartner.com/Content.plx?P=A&A=1437&S=4&SourceID=62