Answer :
Final answer:
The best initial course of treatment for a 4-year-old girl with mild flank pain and fever, positive for leukocyte esterase and nitrites in the urinalysis, is to start her on a course of antibiotics. It is likely that she has a urinary tract infection (UTI) and waiting for the urine culture results will help determine the specific bacteria causing the infection.
Explanation:
The best initial course of treatment for a 4-year-old girl with mild flank pain and fever, positive for leukocyte esterase and nitrites in the urinalysis, is to start her on a course of antibiotics. Given her symptoms and positive test results, it is likely that she has a urinary tract infection (UTI). Pyelonephritis, a serious kidney infection, should also be considered. Common antibiotics used to treat UTIs include fluoroquinolones, nitrofurantoin, cephalosporins, or a combination of trimethoprim and sulfamethoxazole. However, it is important to wait for the results of the urine culture to determine the specific bacteria causing the infection and choose the most appropriate antibiotic.
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