American Immigrant Stories on Instagram: "In 1907, New York City officials labeled an Irish immigrant cook the most dangerous woman in America. She had never been convicted of a crime. She had never even been sick. Her name was Mary Mallon. As a private cook for wealthy families, something terrifying kept happening — wherever she worked, people fell ill. Typhoid fever spread through mansions that were never supposed to see it. But how could one woman be blamed for a disease she didn’t even know