Pathology Most common cause of acute pyogenic meningitis in adolescents and young adults: September 2003 A H. influenzae B N. meningitidis C Staph. aureus D Group B streptococci 💡 Explanation Most common cause of acute pyogenic meningitis in adolescents and young adults: September 2003 ✓ Correct Answer: B. N. meningitidis