In neonatal meningitis, initial empiric therapy commonly includes which regimen?

• A. Ampicillin plus gentamicin
• B. Cefotaxime alone
• C. Vancomycin plus aztreonam
• D. Piperacillin-tazobactam alone

Answer: (A)

The main idea is to rapidly cover the pathogens most likely to cause meningitis in newborns: Group B Streptococcus, Listeria monocytogenes, and gram-negative enteric organisms such as E. coli. Ampicillin targets Listeria and Group B Streptococcus, while adding gentamicin provides broad gram-negative coverage, including E. coli. In the setting of meningitis, inflamed meninges allow better drug penetration into the CSF, so this combination is a practical, widely used initial empiric regimen while cultures are pending. Other regimens either miss Listeria coverage (for example, cefotaxime alone) or focus on organisms not typical in neonatal meningitis, and thus don’t offer the balanced, targeted coverage needed at presentation.