(b) Escherichia coli
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Escherichia coli is the causative agent of 80% of urinary tract infections. Staphylococcus aureus causes toxic shock syndrome. Proteus mirabilis causes about 13% of nosocomial UTIs. Staphylococcus epidermidis causes infections in patients using a catheter for a long period of time. Pseudomonas aeruginosa causes infections following the use of instruments in examining urinary tracks.