A horse from Hampshire County and a llama from Worcester County also recently tested positive for West Nile.
A second human case of West Nile virus has been confirmed in Box Elder County.
The virus can infect people of all ages, but people over the age of 50 are at higher risk for severe illness.
The county has recorded two cases of West Nile Virus this year.
Officials say the virus is mainly transmitted to people through the bite of an infected mosquito.
"The rain Denton County has received [last] week cannot be attributed to these recent cases, but standing water left from rain last month could have left breeding grounds for these mosquitoes", Rainey said. Those are EPA approved mosquito repellents to prevent bites. Oil of lemon eucalyptus should not be used on children under three years of age. "Be sure to wear long sleeve shirts and trousers".
Staying indoors when mosquitoes are most active (dusk and dawn). Some of the most common places that water collects are gutters, jar lids, tires and flower pot trays.
Screens should be used to keep mosquitoes outside of homes. If an animal is diagnosed with West Nile virus or EEE, owners are required to report to the Division of Animal Health by calling 617-626-1795 and to the DPH by calling 617-983-6800.
West Nile virus symptoms include headache, body aches, joint pains, vomiting, diarrhea or rash.
For more information contact the health contact at 424-0272, www.columbiana-health.org or on Facebook.