A growing number of Dengue fever cases are promoting a warning from Florida health officials. Martin and St Lucie countries are covered by a new health alert after seven more human cases of the illness were confirmed. Dengue fever was nearly eliminated in the US for decades only to resurface in the Florida Keys before heading north. People are urged to eliminate standing water on their property and use insect repellents containing DEET and avoid time outdoors at dusk and dawn when mosquito are most active. Dengue fever is not deadly but can cause headaches, fever and joint pain.