Even for a disease that moves on wings--of birds and mosquitoes--the West Nile virus is spreading with remarkable speed. Three years after making its first U.S. appearance, in New York, it has spread to 33 other states. This year, after being largely confined to a thick band of East Coast states, the virus has swept rapidly west, reaching as far as South Dakota and Texas. Last week it struck with a vengeance in Louisiana, infecting at least 58 residents and killing four--prompting Governor Mike Foster to declare a statewide emergency.
The westward expansion caught officials from the Centers for Disease Control...
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