Thank you for your query.
The total WBC count
of 16,500/cu mm. is certainly very high. As you have not mentioned the differential count I presume the neutrophils must be raised. The counts and the description suggests an infective process in the right leg. I suggest you discuss with the doctor and start a course of antibiotic pending further investigations.
The counts are not suggestive of leukemia
as feared by you.
I hope I have answered your query to your satisfaction.
Wishing your son an early recovery.
Rajiv K Khandelwal