Many fundamental questions about valley fever remain a mystery, but if a new study by the Kern County Public Health Services Department is successful, one may soon have an answer.  Although most people are aware that valley fever is spread when spores in the dirt become airborne and inhaled, few studies have looked at what happens to those spores once they get in the air.   The health department, with a donation from the national Centers for Disease Control and Prevention, hopes it can be among the first groups to track the fungus once it leaves the ground.