Engel, Mark E., and Bongani M. Mayosi. “Clinical and Epidemiological Aspects of Streptococcus Pyogenes Pharyngitis and Carriage in Africa”. SA Heart Journal 10, no. 2 (March 31, 2017): 434–439. Accessed March 10, 2026. https://www.journals.ac.za/index.php/SAHJ/article/view/1802.