Sherry D. Martinez thought she had the flu. The then-45-year-old had all the usual symptoms—fever, fatigue, sore joints—and then some. When it became difficult to breathe, a doctor diagnosed her with pneumonia and sent her home with antibiotics. A few days later, bumps appeared on Martinez’s skin. When she scratched at them, they oozed. Her doctor put her on stronger antibiotics, but still her condition worsened. She developed a rash and severe eye pain.