1From the Department of Medical Microbiology, MRC/SAIMR/WITS Pneumococcal Diseases Research Unit 2From the South African Institute for Medical Research and University of the Witwatersrand, Johannesburg, South Africa; and Department of Pulmonology Johannesburg Hospital and University of the Witwatersrand, Johannesburg, South Africa
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Klugman et al. (1998) studied this question.