Viral Meningitis and Encephalitis 1. Encephalitis 1.1. Background • Encephalitis indicates inflammation of the brain. Meningoencephalitis signifies inflammation of both the brain and meninges. Myelitis is inflammation of spinal cord. • Clinically the terms are useful to differentiate that area which is most affected by the pathologic process. • Any of the viruses associated with encephalitis can be among those which cause aseptic meningitis, however, there are a group of viruses (arboviruses) which cause epidemic encephalitis. In any epidemic, however, one should recognize that there will be a wide spectrum of disease ranging from asymptomatic infection to aseptic meningitis to frank encephalitis. 1.2. Epidemiology • Arboviruses tend to predominate and epidemic disease occurs almost yearly in the US. Certain arboviruses have a predilection for different geographic areas of the US depending on the climate, mosquito vector and the virus itself. • A comparison of the different arboviruses can be found in the accompanying table.
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This note was uploaded on 03/02/2012 for the course BSC BSC1086 taught by Professor Joystewart during the Fall '10 term at Broward College.