Aerial spraying of insecticides in the Dallas area will take place for the first time since the 1960s this week.

The spraying is due to the worst outbreak of the West Nile virus in the nation this year. The company brought in to spray for the mosquitoes in Dallas County have outfitted two planes for spraying on Thursday evening.

Oklahoma health officials are reporting the first West Nile Virus-related death of the year and have issued a public health warning as well.

The Oklahoma State Department of Health on Tuesday said there have been 55 cases of West Nile Virus in 14 counties across Oklahoma. The department did not reveal in which county the death occurred.

Health officials are urging citizens to use insect and mosquito repellant with DEET in the spray.