that is a very easy thing to "misdiagnose". i cant even tell you how many people have come in to my hospital and say their snake as a uri and they need antibiotics, and upon close examination, it was just retained shed in the nostril(s). so, you may want to take a little flashlight and check that out first before you spend money to have them tell you that. im not saying that its not a uri, but it may be worth you checking for that first. also, even if it is a uri, you may have caught it early enough to where you can up your temps and humidity some, and try to see if your snake can fight it off himself. just a couple ideas and suggestions