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DALLAS, Tx. (ABC)-- Most of the country is under watch this morning for cases of the deadly West Nile virus. So far this year, 43 states have reported virus infections in people, birds, or mosquitoes in record numbers.

Almost half the cases are in Texas. Over 80-percent in just six states: Texas, California, Mississippi, Louisiana, Oklahoma, and South Dakota.

West Nile patient Katharyn DeVille descibes her pain, "It's this killer, killer headache. It just makes me feel like somebody has an axe in my head and it hurts really bad."

Two weeks ago, the 42 year old was in good health. But her Flu-like symptoms turned into something much worse.

"When I came in here Thursday for the spinal tap, I was like delirious and couldn't function," DeVille says.

West Nile usually affects the elderly and unhealthy. Most people never even know they have it.

Here are some facts:

Nationwide, the Centers for Disease Control reports 693 cases so far this year. 26 of them have been fatal.

Controversial aerial spraying is set to begin in and around Dallas, Texas as early as Thursday night. It would be the first time they've done that since 1966.

Dallas Mayor Mike Rawlings said, "I'm in a tight window because we have people dying....we have to have a sense of urgency to get this done now. That's what's the most important thing."

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U.S. Health officials are concerned about an outbreak of West Nile Virus