NEW : Officials will offer aerial insecticide spraying to communities hit by virus . NEW : Virus kills 175 people and infects nine more people in Texas , Dallas County . A county judge declares a public health emergency . The country is experiencing its biggest spike in West Nile virus since recent years .
NEW : Officials will offer aerial insecticide spraying to communities hit by virus . NEW : Virus kills nine people and infects 175 more people in Dallas County , Texas . A county judge declares a public health emergency . The country is experiencing its biggest spike in West Nile virus since 2004 .