Bacterial meningitis
There is an intense acute inflammatory infiltrate in the meninges. The inset shows higher magnification of pus marked
with white asterisks in the main photo. The “usual suspects” vary with the patient’s age; group B strep and E. coli in neonates,
S. pneumoniae and L. monocytogenes in the elderly, and N. meningitidis in youths. Infection with H. influenzae, which formerly
was the most common cause in older infants, has been markedly reduced in frequency with the advent of vaccination.
1 minute clinical correlation