J Emerg Med
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The Proteeae group (i.e., Proteus species, Morganella morganii, and Providencia species) frequently causes urinary tract infections (UTIs) and is generally resistant to nitrofurantoin. Proteeae species can produce urease, which can increase urine pH. ⋯ Urine pH of 8 or higher is associated with high rates of nitrofurantoin resistance.