The Iowa Department of Public Health advises late summer and early fall is the peak time for West Nile virus activity and Iowans should take steps to protect themselves from mosquito bites. The virus is carried by mosquitoes There have been 15 human cases of the virus in Iowa and 11 horse cases. Washington, Johnson and Jefferson counties have each had one horse test positive for West Nile virus.

Lynn Fisher with Washington County Public Health reminds people to use an insect repellent when outside. IDPH recommends a repellent with DEET, picaridin, or oil of lemon eucalyptus. Fisher adds clothing is a good barrier, so wear long sleeves, pants and shoes. Mosquitoes are most active at dusk and dawn.

According to IDPH, about 20% of people infected will have mild to moderate symptoms that can include fever, headache, body ache and vomiting. Also, less than one percent of people infected become seriously ill or die.