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DR Medhat MRCP

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• Def : inflammation of meninges.<br />

• Causes :<br />

Meningitis<br />

Bacterial meningitis :<br />

- Pneumococcal meningitis : most common cause & highest mortality (20%).<br />

- Neisseria meningitides (meningiococci).<br />

- Listeria monocytogenes meningitis<br />

- Streptococcal agalactae (group B β-hemolytic streptococci) in neonates.<br />

- Haemophilus influenza.<br />

Non-bacterial (Aseptic) meningitis :<br />

A. Viral meningitis :<br />

- Herpes simplex meningio-encephalitis : 95% of causes in adults.<br />

- EBV meningio-encephalitis.<br />

B. Non-viral meningitis : (TB ,Lyme disease,syphilis ,fugal)<br />

C. Non-infectious meningitis : (sarcoidosis ,neoplastic,drugs).<br />

• Common organisms in relation to age :<br />

0 - 3 months<br />

Group B Streptococcus (most common cause in neonates)<br />

E. coli.<br />

Listeria monocytogenes.<br />

3 months - 6 years<br />

Neisseria meningitidis<br />

Streptococcus pneumoniae<br />

Haemophilus influenzae<br />

6 years - 60 years<br />

Neisseria meningitidis<br />

Streptococcus pneumoniae<br />

> 60 years<br />

Streptococcus pneumoniae<br />

Neisseria meningitidis<br />

Listeria monocytogenes<br />

Immunosuppressed<br />

Listeria monocytogene<br />

• Mode of infection : blood born infection from septic focus e.g pharyngitis,sinusitis,IE<br />

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