For Streptococcal Toxic Shock Syndrome, which IV antibiotic combination is recommended?

• A. Nafcillin + Gentamicin
• B. Vancomycin + Cefepime
• C. Penicillin + Clindamycin IV
• D. Ceftriaxone + Doxycycline

Answer: (C)

Streptococcal toxic shock syndrome is driven by toxin release from group A Streptococcus, so treatment aims to both kill the bacteria quickly and suppress toxin production. High-dose penicillin G rapidly kills the bacteria by inhibiting cell wall synthesis, while clindamycin blocks bacterial protein synthesis, which reduces the production of these toxins and helps blunt the overwhelming inflammatory response. Clindamycin’s effect is beneficial even when bacterial growth isn’t at its peak, and it can dampen the immune-mediated damage seen in toxic shock. This combination addresses both the source of the infection and the harmful toxins, making it preferable over regimens that focus mainly on broad coverage without toxin suppression.