How is purulent meningitis caused?

1. Factors causing purulent meningitis: 1. Purulent meningitis can be caused by any purulent bacteria. 2. The most common pathogens are meningococci, haemophilus influenzae, pneumococcus. Followed by Staphylococcus aureus, Streptococcus, Escherichia coli, Proteus, Salmonella, Pseudomonas aeruginosa. Other rare factors are neonatal meningitis, Escherichia coli, hemolytic streptococci. 2. Route of infection: 1. Adjacent purulent lesions. 2. Caused by craniocerebral injury. 3. Purulent lesions far away, caused by menstrual infection. 4. Some congenital lesions. 5. Neurosurgical infection.