Final answer:
Choosing the correct antibiotic class for Sue depends on several factors, including the type of infection and its causative bacteria. A broad-spectrum antibiotic might be needed if the bacteria isn't specifically identified. A sensitivity test is recommended to determine which antibiotic is most effective before prescribing.
Step-by-step explanation:
To prescribe the correct class of antibiotics for Sue it is crucial to know the type of infection and the specific bacteria causing it. Penicillins are broad spectrum antibiotics effective against a range of bacteria but not against all types. They work by interfering with the synthesis of the bacterial cell wall, making them effective mostly against Gram-positive bacteria. However, resistance to penicillins is common, and many bacteria produce enzymes that can inactivate these drugs.
Cephalosporins, particularly second generation, have a broader range of activity against Gram-negative bacteria compared to the first generation, but it's crucial to perform a sensitivity test to ensure the bacteria causing the infection are susceptible to this antibiotic.
Macrolides, such as erythromycin, target protein synthesis and are primarily used against Gram-positive bacteria and some Gram-negative bacteria but may not be effective against all types of infections.
Fluoroquinolones, like ciprofloxacin, have a broad spectrum of activity and can be used to treat a range of infections, including those caused by Gram-negative bacteria like E. coli. However, because of potential side effects and the risk of promoting antibiotic resistance, they are not always the first choice.
Without more specific information about Sue's condition, it's impossible to give a precise recommendation. A sensitivity test to determine the most effective antibiotic is generally recommended before prescribing.