Final answer:
The presence of nitrites in urine indicates a bacterial infection in the urinary tract. Gram-negative bacteria like E. coli commonly produce nitrites, serving as evidence of infection.
Explanation:
The presence of nitrites in the urine indicates a bacterial infection in the urinary tract. Nitrites in the urine are often produced by Gram-negative bacteria like E. coli, Proteus vulgaris, Pseudomonas aeruginosa, and Klebsiella pneumoniae. These bacteria convert nitrate to nitrite, indicating an active bacterial infection.
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