USA Today: Software engineer Andres Chavez is used to doing things quickly, efficiently and correctly. So he knew something was seriously wrong when, on a business trip in 2009, he was so confused he could barely sign a stack of paperwork.
"I felt like I was living a quarter-second in the past," he says of the onset of Valley Fever, a disease caused by a soil fungus. It took months for his doctor to finally suggest that might be the cause of Chavez's episodes of "getting stupid," as his wife calls it.
"He...