The Oklahoma City-County health Department has confirmed that several samples of mosquitoes have tested positive for carrying West Nile Virus. No human cases have been confirmed. Public Health Protection Director Phil Maytubby says residents should take precautions. He says it's important to wear insect repellant that contains DEET when outside. Also drain any standing water on your property where mosquitoes can breed. West Nile Virus is the most common mosquito-borne illness in Oklahoma and senior adults are especially vulnerable.