What combination of antibiotics is commonly used to treat bacterial meningitis?

• A. Macrolides and tetracyclines
• B. Aminoglycosides alone
• C. Fluoroquinolones
• D. Cephalosporins and vancomycin

Answer: (D)

Bacterial meningitis requires antibiotics that reach the central nervous system and cover the common pathogens, including Streptococcus pneumoniae, Neisseria meningitidis, and, in older or immunocompromised patients, Listeria. A third-generation cephalosporin like ceftriaxone or cefotaxime provides strong, broad coverage for these organisms and penetrates the CSF well when meninges are inflamed. Vancomycin is added to guard against penicillin- and cephalosporin-resistant pneumococci, ensuring protection against resistant strains. Together, this pairing offers broad empiric coverage while the exact cause is identified. The other options don’t provide the same reliable CNS-penetrant, broad-spectrum coverage: macrolides and tetracyclines have limited CNS penetration and aren’t first-line for meningitis; aminoglycosides alone cross poorly into the CSF and are not effective as monotherapy for meningitis; fluoroquinolones aren’t standard empiric therapy due to variable CNS penetration and resistance concerns.