The molecular epidemiology of group A streptococcal pharyngeal infections in children in the Vanguard Community of Cape Town revealed 26 emm types among 157 isolates from 742 subjects. Coverage of a 30-valent vaccine is predicted to be 95% of pharyngitis cases in this population at high risk of rheumatic fever.
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Engel et al. (2013) studied this question.
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