Article: WEST NILE'S VIRULENCE IN U.S. PROBED AS NEW SEASON NEARS.(News)

Byline: Edie Lau Sacramento Bee

From within the glossy feathered bodies of crows, scientists have discerned an unsettling clue to the virulence of the West Nile virus sweeping the United States.

The preliminary research suggests the germ is a mutated strain far deadlier to birds than West Nile strains in most other parts of the world.

Whether it's more dangerous to humans, too, is an open question, but the virus already has caused more cases of neurological illness in people in this country than anywhere else, ever.

That combination has public health officials on edge as warm weather brings forth new legions of mosquitoes carrying West ...

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