Pathophys- Difference in bacterial, aseptic, fungal, & tubercular meningitis

Bacterial meningitis mainly affects the pia mater and arachnoid, subarachnoid space, ventricular system, and the CSF. Meningococcus and pneumococcus are the common causes. Aseptic meningitis is an inflammation thought to be limited to the meninges. This type is mainly caused by viruses such as enteroviruses, mumps, herpes simplex 1 and 2, West Nile virus, Epstein-Barr, Colorado tick fever, and influenzavirus types A and B. Fungal meningitis is a chronic condition and much less common. Some of the most common infections include histoplasmosis, candidiasis, and aspergillosis. It frequently occurs in people with immune response impairment or problems with normal body flora. Syphilis, tuberculosis, and Lyme disease are also associated with fungal meningitis. Tubercular meningitis is the common and dangerous form of CNS tuberculosis. Mycobacteria enter the CSF causing a hypersensitivity reaction that results in a purulent exudate that affects the basal meninges, cerebrum, and spinal nerves. Recovery is 90% effective if caught early and treated with appropriate medications.