The number of human West Nile virus (WNV) in California increased by 67 cases during the past week, bringing the state total to 311 from 29 counties, the most of any state in the union.

New cases were reported from the following counties: Butte (1), Fresno (2), Kern (1), Los Angeles (15), Madera (1), Merced (1), Orange (7), Riverside (26), San Bernardino (3), San Diego (7), Shasta (1), Ventura (1), and Yolo (1).

This is the first WNV human case from Merced County this year.

Thirteen WNV-related fatalities have been reported in to the California Department of Public Health from Butte (1), Kern (1), Los Angeles (3), Nevada (1), Orange (1), Riverside (2), San Bernardino (2), and San Diego (2).

Nationally, as of October 6, 1,197 cases of West Nile virus disease in people have been reported to CDC. Of these, 743 (62%) were classified as neuroinvasive disease (such as meningitis or encephalitis) and 454 (38%) were classified as non-neuroinvasive disease.

Robert Herriman is a microbiologist and the Editor-in-Chief of Outbreak News Today and the Executive Editor of The Global Dispatch

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