The FDA approved pivmecillinam to treat infections caused by Proteus mirabilis, Staphylococcus saprophyticus, and Escherichia coli—the pathogen involved in about 75% of uncomplicated UTI cases.

She also reports fever and chills for 2 days. Urine culture grew Proteus Mirabilis. She was treated with 7 days of trimethoprim-sulfamethoxazole. Fever and chills improved after antibiotic treatment.