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Occurrence of West Nile virus on the increase, CDC reports.(Clinical Rounds)

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| January 15, 2006 | Jefferson, Robin Seaton | COPYRIGHT 2006 International Medical News Group. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

California reported one-third of the 2005 U.S. total of West Nile virus cases through December 1 and 25% of the cases of the viral neuroinvasive disease, the Centers for Disease Control and Prevention reported.

A total of 2,744 human cases of West Nile virus (WNV) disease were reported in 42 states in 2005, compared with 2,359 in 2004. There was a spread of the disease in both humans and animals into counties not previously affected, as well as recurrence where the disease had previously been reported. "The increase ... suggests that endemic transmission of WNV in the United States will continue for the foreseeable future," the CDC said (MMWR 2005;54:1253-6).

WNV infections in humans, birds, mosquitoes, and nonhuman mammals are reported to the CDC through ArboNET, an Internet-based arbovirus surveillance system that is managed by state health departments and the CDC.

Of the cases reported, 1,165 (43%) were WNV neuroinvasive disease (WNND), which includes meningitis, encephalitis, or acute flaccid paralysis; 1,434 (52%) were West Nile fever (WNF); and 145 (5%) were unspecified illnesses.

WNND had its highest incidence in the central United States, including South Dakota, Nebraska, and North Dakota, but ...

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Source: HighBeam Research, Occurrence of West Nile virus on the increase, CDC reports.(Clinical...

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