Social behavior and meningococcal carriage in British teenagers. - MacLennan, Jenny; Kafatos, George; Neal, Keith; Andrews, Nick; Cameron, J. Claire; Roberts, Richard; Evans, Meirion R.; Cann, Kathy; Baxter, David N.; Maiden, Martin C. J.; Stuart, James M.; United Kingdom Meningococcal Carriage Group (Emerging Infectious Diseases, 2006)