Porphyrin is the red stuff... I think I spelled that right. Anyway. Yes, that's often what it indicates. However it can also indicate stress, such as moving to a new home. It would probably be best to get him checked, though. 
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If he seems to be okay otherwise, eating and drinking well, energetic and playful, etc, then it could be okay to wait and see if he's sick or just a bit stressed. But rats can turn downhill quickly so do keep an eye on the baby.
10 days is usually not a long enough course to cure an URI, you'll probably get a baytril/doxy prescription.
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