COVID-19 pandemic in Illinois
The ongoing COVID-19 pandemic began in the U.S. state of Illinois on January 24, 2020, when a woman in Chicago, who had just returned from the pandemic's place of origin in Wuhan, Hubei, China. This was the second case of COVID-19 in the United States during the pandemic. The woman's husband was diagnosed with the disease a few days later, the first known case of human-to-human transmission in the United States.