Community transmission of influenza A (H1N1)v virus at a rock festival in Belgium, 2-5 July 200936827, Gutierrez, I., Litzroth Amber, Hammadi S., Van Oyen Herman, Gerard C., Robesyn E., Bots J., Faidherbe M.T., and Wuillaume Françoise , Euro.Surveill, 6/8/2009, Volume 14, Issue 31, (2009)