The vuvuzelas can infect others on a greater scale than coughing or shouting. Manchester United banned vuvuzelas from Old Trafford on August 13, 2010. The vuvuzelas have the potential to cause noise-induced hearing loss. Other critics remarked that vuvuzelas disrupted team communication and players' concentration during matches. Television and radio audiences often heard only the sound of vuvuzelas. In Wisconsin, anti-Scott Walker, pro-union 2011 Wisconsin protesters have made use of vuvuzelas. Vuvuzelas were a common feature of Oxegen 2010. The Madison police even issued permits for use of the vuvuzelas "inside" the capitol. The vuvuzelas raised health and safety concerns.