Fig. 1From: Assessing the impact of pneumococcal conjugate vaccines on invasive pneumococcal disease using polymerase chain reaction-based surveillance: an experience from South AfricaEnrolment of cases with severe acute respiratory illness (SARI program) and cases of culture-positive invasive pneumococcal disease (GERMS program) hospitalized at Chris Hani-Baragwanath Academic Hospital, Soweto, South Africa, 2009–2012Back to article page