Um, I don't know this ped personally, but asking if your DH was circ'd was, IMO, totally inappropriate. I would've answered, "None of your business" or "not relevant to my child's fever of unknown origin."
I take it this is not your normal pediatrician? If I were you -- and Im not! -- I would be shopping pediatricians. If my memory serves me correctly, this isn't the first time you've been concerned/irritated by this/your ped on the circ topic. He/She is incorrect that your son's intact status makes him more likely to have a UTI. That study was a terribly designed study that compared full-term circ'd babies to intact preemies in the NICU -- not at all apples-to-apples! Other studies have NOT found any causal relationship between being intact and being at risk for UTI. If anything makes BOYS more likely to get a UTI it would be congenital issues with the kidneys and ureters (which sometimes accompanies undescended testicle(s), but not always.)
You are correct that you have to watch for UTI in all kids, regardless of gender and intactness, though little girls are FAR more likely to get a UTI than a boy regardless of his intactness or circ status. However, there are other things I would consider: for example, did this ped also ask you about meningitis? In a child that age with FUO (fever of unknown origin), meningitis should also be considered as a dx, not ONLY UTI. Sounds like you ruled out an ear infection, which would be another common culprit. However, in a child that age, the MOST LIKELY CAUSE of fever is ... drum roll ... a virus. (Esp with an older child at home -- which I somehow think you do, a DD? Is that right? I may be confused, it happens a lot these days). ESP in this case, where your son's WBC and CBC were normal ... hmmm. Color me skeptical that he has anything that requires medical treatment beyond some baby tylenol if he is uncomfortable.
However, it is YOUR son, and you know him best -- do you think he seems "seriously" sick, or just febrile (has a fever)? I know these are old wives' tales, but sometimes babies get fevers when they're teething, sometimes they get fevers because they're overheated and can't sweat well, sometimes they just get a fever and it goes away on its own ... But only you can judge the relative seriousness of his condition.
Back to my original topic: IMO, your ped/peds has/have struck out at least twice on this topic. From other posts here, you seem really uneasy about it for some reason -- I don't think you regret leaving your son intact, but I think you are very worried about issues related to his being intact -- e.g., your ped retracting, always bringing up circ, etc. I believe that, if you had a more intact-friendly ped for your son (maybe you like your current ped for your DD? that's my recollection), you might feel more confident about your son's status, your decision, etc. Which in turn will make your SON more confdient in the long run, too.
I don't mean to sound bossy -- at all! -- believe me, I know how hard it can be in some areas to find an intact-friendly ped or FP doctor. I cringe ever time I see a "freaked out" post -- on something that is totally natural and normal (foreskin!) I *do* understand why moms and dad "freak out" -- I think that the US medical community causes this worry unnecessarily. I also believe that it's our duty as parents to refute those sorts of false worries/concerns ... either by confrontation (e.g., "you are totally wrong, dr. circ!") or by taking our money elsewhere (e.g., finding a ped/FP/NP who respects our decision to leave all of our children intact, period).
All that aside, I really hope your little guy is feeling better, and that your concerns have been lessened, at least for now. Take care!