COVID-19 Public Health April 6, 2021Some people interact with many others in the course of a day; others see very few. Sounds basic, but it’s a critical distinction, often overlooked in epidemiological models, and may explain the sharp rise and recent fall in US COVID-19 cases. We strive to provide individuals with disabilities equal access to our website. If you would like information about this content we will be happy to work with you. Please email us at: McKinsey_Website_Accessibility@mckinsey.com To read more, see “All in the mix: Why US COVID-19 cases rose and fell, and what comes next,” March 29, 2021.