BackMany first-aid antibiotic ointments, such as the bran-name product Neosporin®, contain bacitracin, neomycin (an aminoglycoside), and polymyxin B. Based on your knowledge of these drugs, which of the following answer choices best completes the statement below?
Together, these drugs can be expected to:
Some types of Gram-negative bacteria are less susceptible to polymyxin B and polymyxin E. Which of the following could explain why that is the case?
William has a bacterial infection from a cut on his leg, and his doctor has identified the cause as a Gram-negative strain of bacteria. Which of the following would be the most appropriate antimicrobial for the doctor to recommend to William?