Cohen, Cheryl;von Mollendorf, Claire;de Gouveia, Linda;Naidoo, Nireshni;Meiring, Susan;Quan, Vanessa;Nokeri, Vusi;Fortuin-de Smit, Melony;Malope-Kgokong, Babatyi;Moore, David;Reubenson, Gary;Moshe, Mamokgethi;Madhi, Shabir A.;Eley, Brian;Hallbauer, Ute;Kularatne, Ranmini;Conklin, Laura;O'Brien, Katherine L.;Zell, Elizabeth R.;Klugman, Keith;Whitney, Cynthia G.;von Gottberg, Anne;for the South African Invasive Pneumococcal Disease Case-Control Study Group;