Transmissibility of the Ice Bucket Challenge among globally influential celebrities: retrospective cohort study.

ABSTRACT:

Objectives

To estimate the transmissibility of the Ice Bucket Challenge among globally influential celebrities and to identify associated risk factors.

Design

Retrospective cohort study.

Setting

Social media (YouTube, Facebook, Twitter, Instagram).

Participants

David Beckham, Cristiano Ronaldo, Benedict Cumberbatch, Stephen Hawking, Mark Zuckerberg, Oprah Winfrey, Homer Simpson, and Kermit the Frog were defined as index cases. We included contacts up to the fifth generation seeded from each index case and enrolled a total of 99 participants into the cohort.

Main outcome measures

Basic reproduction number R0, serial interval of accepting the challenge, and odds ratios of associated risk factors based on fully observed nomination chains; R0 is a measure of

SUBMITTER: Ni MY 

PROVIDER: S-EPMC4267700 | biostudies-literature | 2014 Dec

REPOSITORIES: biostudies-literature