Fig. 5

Network component area map and county level confirmed case distribution for the USA. At this scale, the large number of smaller components with fewer cases are not resolved. Case density scales with population density, with the largest numbers in dense urban cores throughout the country. In contrast to China, there is no single epicenter but many large cities with > 10⁴ cases. Similar to China, there are case density gradients within the larger network components. Enlarge to see detail