An outbreak of dengue fever in Mexico has health officials here in Texas keeping a watchful eye across the border. More than 100 people have been infected in the southern state of Morelos. Several people have the hemorrhagic strain of the disease that causes bleeding and, if untreated, possibly death. To prevent the spread of the disease, health workers need to enlist the help of the residents. Oswaldo Zambrano, dengue fever prevention program director, says the enemy lives among them. He warns residents that they are providing a safe haven for the mosquitoes that carry dengue fever. Many homes have...