7 year old son with recurring fever

[Oliver5]

My 7 year old son has had recurring high fevers every 3 to 5 weeks that last from 2 to 4 days.  (This past fever is the 5th one that has occurred).  He has been diagnosed and treated for strep and sinus infections, but nothing more.  The doctors have tested for mono, pneumonia, lyme disease - all which were negative.  What could possibly be wrong?  He has no other symptoms aside from the high fever. Any ideas would be appreciated.

[snowgoer]

Make sure that you replace your son's toothbrush after being treated, this a very frequent cause of reinfection.....just a thought.

[ozark]

how long was he treated for his sinus infection? sometimes it takes a 3 week course to resolve it. does he have allergies? this can prolong sinus infections.  With a little blood in his urine thats good he is having it repeated.  Have they repeated the sinus ct to see if the sinuses have resoved?

[Oliver5]

Yes, he has had a few urine cultures.  Ones in the past were normal. Most current one done,however,showed a slight trace of blood.  Will be retaking culture this week.

He has also had blood tests done(one indicated an infection diagnosed as strep), chest x-rays (normal result), and head x-ray (indicated a sinus infection).  Nothing accurate or conclusive has resulted from tests. He has been treated for each diagnosis(with antibiotics), gets well (episodes in between the time he gets fevers are illness free) and then gets sick (feverish) again.

Based on testing done by doctors, we get a different diagnosis each time he gets sick/fevers.  The only common symptoms are the fevers (very high), occasional headache (probably associated with the fever) and that he is low in iron (which probably isn't even a symptom, just thought it was worth mentioning).

Today when I looked in his throat, he had white dots on his tonsils.  Could his sickness be related to tonsils or even adnoids?

Thanks for your help.