A record 27 deaths were documented among L.A. County's 268 cases past year.
Health representatives of LA are concerned over the death case from the West Nile virus.
Davis also warned that standing water sources could lead to mosquito breeding, even in items as small as a bottle cap.
Officials say most people infected do not become ill but if they do, the virus can cause headaches and fever, body aches and occasionally, a skin rash or swollen glands.
West Nile virus kills an average of 107 people each year in the United States.
Given the especially wet spring and summer, keeping mosquitoes under control has been a problem with one of the primary defenses being the elimination of standing water, which has been hard this year.
Mosquitos are sorted at the Dallas County mosquito lab in Dallas.
All county residents are encouraged to take protective action to prevent mosquito bites, especially as additional cases are expected to occur this year. Last year's WNV season was the longest season on record extending until mid-December. The individual in question had been hospitalized since September, according to the county Department of Public Health. Health officials did not release details about the patients who died. Almost half have been in Cook County, but a few other East Central Illinois counties - Coles, Edgar and Ford - have each had one human case this season, too, according to IDPH. They are available as sprays, wipes and lotions. Fix or replace screens with tears or holes. Ensure that swimming pools, spas, and ponds are properly maintained.