The total number of West Nile cases in Louisiana now stands at 13.
On Friday The Louisiana Department of Health and Hospitals announced that four new West Nile cases have surfaced in Quachita and Vernon parishes.
This week's new infections include two cases of neuroinvasive disease and two asymptomatic cases.
Humans contract West Nile when they are bitten by mosquitoes infected with the virus.
West Nile neuroinvasive disease is the most serious type, infecting the brain and spinal cord and can lead to death, paralysis and brain damage.
About 90 percent of all cases are asymptomatic which means the person shows no symptoms. While about 10 percent will develop West Nile fever in which people experience flu-like symptoms.
Caldwell and Calcasieu parishes also each have one case of West Nile virus neuroinvasive disease.