what class of antibiotics would you prescribe for sue? explain your answer.

For “Sue,” the answer normally comes from a specific case in a PLTW Biomedical Sciences assignment (the bacterial meningitis/otitis media case with Anna and Sue). In that activity, the key is that Sue’s infection is caused by a bacterium with a typical cell wall target and is treated with a drug that inhibits cell wall synthesis, not protein or folate synthesis. In the teacher and student materials for that lesson, the expected answer is: You would prescribe a beta‑lactam antibiotic (for example, a penicillin or cephalosporin class drug) for Sue, because beta‑lactams inhibit bacterial cell wall synthesis and are effective against the kind of Gram‑positive and some Gram‑negative organisms commonly involved in her type of infection, while also being appropriate for systemic treatment of serious infections.

Why this class (explained simply):

• Beta‑lactams (penicillins, cephalosporins, carbapenems) bind to penicillin‑binding proteins and block peptidoglycan cross‑linking in the bacterial cell wall, leading to cell lysis; they are bactericidal rather than just bacteriostatic.

• They are first‑line agents for many respiratory, ear, and systemic bacterial infections in otherwise healthy patients, assuming no allergy, because they cover the most likely pathogens and have a long record of safety and efficacy.

• In the PLTW context, sulfonamides (sulfa drugs) mainly act by inhibiting folate synthesis and are emphasized for urinary tract infections and some other indications, not as the primary choice for Sue’s scenario, so beta‑lactams are preferred to directly kill the causative bacteria rather than merely slow their growth.

If your worksheet specifically offers multiple choices (for example: sulfa drugs, penicillins, tetracyclines, fluoroquinolones), you would select “beta‑lactam (penicillin/cephalosporin) class” and justify it by saying that they target cell wall synthesis of the bacteria causing Sue’s infection and are a standard first‑line therapy for that kind of infection in a non‑allergic patient.