Central Nervous System Infections
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Central Nervous System Infections
Central nervous system infections are usually:
Blood-borne invasion; most common
(e.g. polioviruses or Neisseria meningitidis)
Invasion via peripheral nerves; less common
(e.g. herpes simplex, varicella-zoster, rabies)
Blood-borne invasion takes place across:
- blood-brain barrier (encephalitis)
- blood-cerebrospinal fluid (CSF) barrier (meningitis)
Invasion via peripheral nerves:
* Herpes simplex virus (HSV) and varicella-zoster virus (VZV) present in skin or mucosal lesions travel up axons to reach the dorsal root ganglia.
* Rabies virus, introduced into muscle tissues by:
- bite of a rabid animal
- It enters peripheral nerves and travels to CNS,
to reach the neurons
Pathologic consequences of CNS infection
In CNS; viruses infect neural cells, sometimes showing a marked preference
Polio and rabies viruses invade neurons. CJD virus invades oligodendrocytes
Spread of infection is direct from cell to cell along established nervous pathways
Bacteria and protozoa induce brain abscesses
Meningitis
* Meningitis is one of the most terrifying disease
* It can be fatal in hours
* Early symptoms resemble
self-limiting conditions
(flu and colds)
Most common causes of meningitis are:
a) Bacterial infections (Septic meningitis)
may result in death or brain damage.
b) Viral infections (Aseptic meningitis)
usually resolve without treatment.
Bacterial Meningitis (Septic Meningitis)
Pneumococcal, Streptococcus pneumoniae (38%)
Meningococcal, Neisseria meningitidis (14%)
Haemophilus influenzae (4%)
Staphylococcal, Staphylococcus aureus (5%)
Tuberculous, Mycobacterium tuberculosis
Viral Meningitis (Aseptic meningitis)
Etiological Agents:
Enteroviruses, most common (Coxsackie and Echovirus)
Adenovirus
Arbovirus
Measles virus
Herpes Simplex virus
Varicella Zoster virus
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رد: Central Nervous System Infections
ايه كل المواضيع الجمدة دي
Abotreka- مــراقـب عــام
- عدد المشاركات : 8531
البلد : في الشقة اللي قصاد جيرانا
تاريخ التسجيل : 01/07/2010
المود :
مواضيع مماثلة
» The Central Nervous System - March 2010 Edition
» Nervous System"websites"
» Barr's The Human Nervous System: An Anatomical Viewpoint, Ninth Edition
» Barr's The Human Nervous System: An Anatomical Viewpoint, Ninth Edition
» Central venous line placement-CVP
» Nervous System"websites"
» Barr's The Human Nervous System: An Anatomical Viewpoint, Ninth Edition
» Barr's The Human Nervous System: An Anatomical Viewpoint, Ninth Edition
» Central venous line placement-CVP
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