Two more birds have tested positive for West Nile virus in La Salle County, bringing the total to four so far this year.
The Grundy County Coroner's Office also confirmed an 85-year-old La Salle County man who contracted West Nile died Aug. 25 at Morris Hospital. Authorities have not released the man's name.
The La Salle County Health Department reported that crows from Ottawa and Peru were the most recent birds to test positive. Crows collected in Streator, Ottawa and La Salle previously tested positive.
A batch of mosquitoes from Ottawa also previously tested positive.
West Nile virus is transmitted through the bite of a mosquito. Common symptoms include fever, nausea, headache and muscle aches. Symptoms last from a few days to a few weeks. Four out of five people infected will not show any symptoms. In rare cases, severe illness, including meningitis or encephalitis, or death, can occur.
Health officials remind residents to take precautions to avoid being bitten by mosquitoes.