In a recent study, a high percentage of the African oryx in New Mexico--which were first introduced to the White Sands Missile Range in the late 1960s--tested positive for exposure to a new form of malignant catarrhal fever (MCF). What does this mean for the oryx now? Not much. They haven't exhibited any symptoms, and the disease could be a normal part of their biology. What could this mean for native deer populations in the future? A lot. It's not yet known whether the new form of MCF affects deer, but if a deer falls ill to other forms it usually dies within days. Oryx are already tough competition for mule deer, and the study has biologists concerned.