The puppy bite has nothing to do with your son's urinary infection which is due to reflux of urine from the bladder up the ureters to the kidneys. This is usually due to an inborn defect in the function of the valves which usually prevent this reflux of urine. Zinnat may not be a good choice as an antibiotic for this kind of urinary tract infection. There are more effective antibiotics available. Your son must be treated by a paediatric urologist.
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