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ATLANTA (AP) - The nation's summer heat wave has spurred a jump in West Nile virus cases, and this will probably be the worst season for the mosquito-borne disease in three years, health experts said this week.
"That's the general trend," said Dr. Lyle Petersen of the U.S. Centers for Disease Control and Prevention.
Cases of the virus are down in many states, where West Nile has become customary and some birds have developed immunity. But activity has been heavier in some parts of the western United States with limited past exposure to the virus.
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