SANTA FE, N.M. (AP) - Six years ago, people in a vast stretch of the Southwest were fearful of            a mysterious, flu-like illness that was killing the previously healthy with frightening speed. The fear            is back. Four New Mexicans and one person from Colorado have died this year of hantavirus,            and experts are worried this could be the beginning of an especially bad year for the mouse-borne            disease. Since the beginning of 1998, there have been more than two dozen cases in the Four            Corners states of New Mexico, Arizona, Utah and Colorado - more than twice as many as in the            previous three years combined, said Dr. Brian Hjelle, associate professor at the University of New            Mexico School of Medicine.