The Orange County Mosquito and Vector Control District was spraying for West Nile virus-infected mosquitoes in Anaheim and Buena Park Thursday morning.
Workers are scheduled to spray the pesticide DeltaGard from a truck until 3 a.m. in neighborhoods around North Dale and La Palma avenues in Buena Park and La Palma Avenue and Brookhurst Street in Anaheim, according to the district.
Officials noted an uptick in the presence of adult mosquitoes and dead birds with West Nile virus in the areas targeted for spraying, according to The Orange County Register.
Residents do not need to take special precautions before or during the spraying. If the driver of a spraying truck notices people in the area, the driver will wait for the people to leave the area before spraying the pesticide, the district said.
One case of West Nile virus has been reported in Orange County this year, a Tustin woman in her 50s, the Orange County Health Care Agency reported.
In 2018, 12 people were infected with the virus and one patient died.
Crews will be spraying in Bastanchury Park in Fullerton Thursday and Friday due to the presence of West Nile virus and an abundance of mosquitoes, the district said.