Contact: Inga Kiderra
University of California - San Diego
Caption: The largest component, 714 people, of the social network studied by Fowler and Christakis, on Dec. 8, 2009. Infected individuals are colored red, friends of infected individuals are colored yellow, and circle size is proportional to the number of friends infected.
Credit: Courtesy James Fowler, UC San Diego
Usage Restrictions: With attribution to study and study authors
Related news release: The friendly way to catch the flu