Read an excerpt from a memoir of a young woman who died of a superbug infection

Salt had always been a fundamental part of Mallory Smith’s life. Like all babies born with cystic fibrosis, Mallory had inherited two defective copies of a gene responsible for balancing the salt and water in sweat. The disease caused a thick mucus to form in her lungs, trapping bacteria and triggering infections, and leaving her skin a little salty.