Question #4 explained
Under which circumstance is nitrofurantoin a potential option for a urinary tract infection?
NOTE: Nitrofurantoin is only used for treatment of urinary tract infection, which is most commonly caused by Gram negative bacteria E. coli. This can help you remember that nitrofurantoin can be used against E. coli. It is also active against some Klebsiella isolates, but is has little to no role in treating Pseudomonas spp. or Proteus spp.
A. Infecting organism is E. coli – CORRECT
B. Infecting organism is Pseudomonas aeruginosa – INCORRECT: nitrofurantoin lacks coverage for this organism
C. Infecting organism is Klebsiella pneumoniae – CORRECT
D. Infecting organism is Proteus mirabilis – INCORRECT: nitrofurantoin lacks coverage for this organism