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The last time Dallas used aerial spraying to curb the mosquito population, Texas' Lyndon Johnson was in the White House, Mission Control in Houston was launching Gemini missions and encephalitis was blamed for more than a dozen deaths. But for the first time in more than 45 years, Dallas County has launched an aerial assault on the flying pests. Aircraft took off at 10 p.m. Thursday to spray insecticide over the county's northeastern quadrant to combat the nation's worst outbreak of West Nile virus. That outbreak has killed 10 people and caused at least 230 others to fall ill.