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Preventing Chronic Disease (PCD) is a peer-reviewed electronic journal established by the National Center for Chronic Disease Prevention and Health Promotion. PCD provides an open exchange of information and knowledge among researchers, practitioners, policy makers, and others who strive to improve the health of the public through chronic disease prevention.

October 15, 2015, marks the 8th annual Global Handwashing Day. This observance increases awareness and understanding of handwashing with soap as an effective and affordable way to prevent disease around the world.

Bullying is "any unwanted aggressive behavior(s) by another youth or group of youths who are not siblings or current dating partners that involves an observed or perceived power imbalance and is repeated multiple times or is highly likely to be repeated" (1). As a form of youth violence, bullying can include aggression that is physical (e.g.

Amanda Kamali, MD1,2; Chhandasi P. Bagchi, MPH3; Emmanuel Mendoza, MPH3; Dulmini Wilson, MPH3; Benjamin Schwartz, MD2; Laurene Mascola, MD2.

Amelia M. Kasper, MD1,2; Alison D. Ridpath, MD2; Justin K.

Sarah Schillie, MD1; Trudy V. Murphy, MD1; Nancy Fenlon2; Stephen Ko, MD3; John W. Ward, MD1.

On October 6, 2015, this report was posted as an MMWR Early Release on the MMWR website (http://www.cdc.gov/mmwr).

Brigette Gleason, MD1; John Redd, MD2; Peter Kilmarx, MD3,4; Tom Sesay, MD5; Francis Bayor5; Antons Mozalevskis, MD6; Allison Connolly6; James Akpablie, MD6; Dimitri Prybylski, PhD3,7; Daphne Moffett, PhD3,8; Michael King, PhD9; Micah Bass10; Kristy Joseph3; Jefferson Jones, MD1; Francis Ocen11.

This is another in a series of occasional MMWR reports titled CDC Grand Rounds. These reports are based on grand rounds presentations at CDC on high-profile issues in public health science, practice, and policy. Information about CDC Grand Rounds is available at http://www.

Kristen Mahle Gray, MPH1; Eduardo E Valverde, DrPH1; Tian Tang, MS2; Azfar-e-Alam Siddiqi, MD, PhD1; H. Irene Hall, PhD1.