The Brazos County Health Department has confirmed a fourth human case of West Nile and is awaiting tests on four other cases.
The Texas Department of State Health Services laboratory confirmed the positive results August 18, according to Brazos County Health Department officials.
Four additional human cases with presumptively positive lab tests are awaiting confirmation by the state laboratory.
When a hospital's tests on a person come back positive for West Nile, the health department considers the case presumptive positive.
Citing medical confidentiality and personal privacy reasons, the Brazos County Health Department will not provide information about the patients.
In 2005, three human cases were confirmed in Brazos County, according to the health department.
Anyone who notices symptoms that include nausea, muscle spasms, severe headaches, swelling, a rash, disorientation and high fever is urged to consult a doctor.
The health department urges area residents to protect themselves from mosquitoes by wearing insect repellent containing DEET, wear long-sleeved shirts and pants while outdoors and avoid being outside at dusk and dawn - the most active times for mosquitos. Officials also advise residents to drain standing water around their homes in order to eliminate mosquito breeding grounds.