Nasopharyngeal competition dynamics are likely to be altered following vaccine introduction: bacteriocin prevalence and diversity among Icelandic and Kenyan pneumococci by Butler, MEB, Jansen van Rensburg, MJ, Karani, A, Mvera, B, Akech, D, Akter, A, Forrest, C, van Tonder, AJ, Quirk, SJ, Haraldsson, G, Bentley, SD, Erlendsdóttir, H, Haraldsson, Á, Kristinsson, KG, Scott, JAG, Brueggemann, AB