Trucks will spray a liquid insecticide to kill adult mosquitoes in residential and nonresidential areas.
Helicopters will spray larvicide on nonresidential areas, such as marshes. The larvicide will kill mosquito larvae before they become adults.
West Nile virus has neither a human vaccine nor a specific treatment. People over 50 years of age are most at risk, even more than children, the DOH said.
People who are infected with West Nile virus can experience mild fever symptoms or be entirely symptom-free.
Most people who become infected will get better without treatment, but hospitalization can be required in more severe cases.