Weather shift curbs West Nile
West Nile virus in Oklahoma

BY Jim Killackey
Published: October 7, 2008

State reports of West Nile virus are down sharply this year with only nine confirmed cases and no deaths.

Last year in Oklahoma, there were 107 cases of the mosquito-borne virus; eight were fatal.

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Oklahoma public health authorities said weather is the likely reason for the good news.

"What we do know is that the 2008 West Nile virus season is turning out to be almost the polar opposite of what Oklahoma experienced in 2007,” state epidemiologist Dr. Kristy Bradley said Monday.

Last year, Oklahoma had heavy rains and flooding in some areas in June and July, then a drying-out period. That was the right mix of weather ingredients for the worst season of the virus for human illness and death since the virus entered Oklahoma in 2002, Bradley said. This year has been different.

"During August we experienced a lot of rainfall and this appeared to suppress the virus spread that normally accelerates in that month,” Bradley said.

Bradley said most cases this year have been milder West Nile fever instead of life-threatening West Nile encephalitis.

Officials warn people to protect themselves from mosquitoes, especially in the morning and evening.


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