A person with a gram positive Staphylococcus aureus infection was treated with the antibiotic penicillin. However it was not effective because the bacteria carried a resistance gene. What antibiotic is best to use next? a. carbapenum b. collistin c. amphotericin B d. methicillin e. none of the above

A person with a gram positive Staphylococcus aureus infection was treated with the antibiotic penicillin. However it was not effective because the bacteria carried a resistance gene. What antibiotic is best to use next?
a. carbapenum
b. collistin
c. amphotericin B
d. methicillin
e. none of the above

Answer

• methicillin
  Explanation:
  The overall percentages of S. aureus sensitive to antibiotics are as follows: Methicillin 85%, penicillin 8%, gentamicin 89%, ciprofloxacin 85%. According to this data, the next antibiotic that can effectively be used against the bacteria in the above options is methicillin which is more effective than penicillin.