“How can soccer or book club be so dangerous? Why ask so much of people for just a few hundred cases?" said Dr. Emily Landon, medical director of antimicrobial stewardship and infection control at University of Chicago Medicine. “Because it’s the only way to save those lives. And now is the time, because the numbers you see today in the news are by the people that got sick a week ago, and there are still people who got sick today and haven’t even noticed that they got sick yet.”