Summary of Notifiable Diseases,
United States 1998

Graphs and Maps

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Arboviral Encephalitis reported cases caused by California serogroup viruses, by month of onset, United States, 1989-1998

California serogroup viruses (mainly LaCrosse virus in the eastern United States) are an endemic cause of encephalitis, especially among children. In 1998, a total of 97 cases were reported from 11 states. During 1964–1998, a median of 65 cases (average: 74) were reported each year in the United States.