Viral Meningitis and Encephaliti2

A comparison of the different arboviruses can be

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A comparison of the different arboviruses can be found in the accompanying table. Herpes simplex virus is the most important cause of sporadic fatal encephalitis. Recognition is critical since this infection is a treatable form of viral encephalitis. Many other viruses are capable of causing acute encephalitis including other members of the Herpes virus family, enteroviruses, mumps, LCM, adenovirus, and postvaccinal. 1.3. Clinical Manifestations Meningoencephalitis usually begins with the acute onset of fever, headache, vomiting and stiff neck. Encephalitis is suggested by drowsiness, paralysis, coma, convulsions, ataxia, psychosis, and papilledema. The electroencephalogram is usually diffusely abnormal with arboviral encephalitis. The CSF may vary between several hundred and several thousand white blood cells. Generally there is a lymphocyte predominance but Eastern Equine Encephalitis may have a polymorphonuclear predominance, especially in the early stages. The protein is usually elevated to 300-400 mg per dl. The glucose is usually normal (but may be depressed with H. simplex). Herpes simplex encephalitis frequently has a temporal lobe focus on EEG, brain scan, CAT scan, MRI or arteriogram. The CSF frequently shows several thousand red blood cells in addition to a mildly elevated WBC. The glucose may be slightly depressed. Because viral encephalitis involves the brain diffusely, such processes like secretion of inappropriate ADH may occur with resultant hyponatremia.
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  • Fall '10
  • JoyStewart
  • Anatomy, Herpes simplex virus, Herpes simplex

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