Flu in a Social Network (image) 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 Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.