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. 2010 Jun;16(6):955–962. doi: 10.3201/eid1606.091820

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Percentage of pilus islet 2 (PI-2)–containing Streptococcus pneumoniae invasive isolates among serotypes associated with PI-2 in metropolitan Atlanta, Georgia, USA, 1999 and 2006. The total number of isolates for each serotype is shown at the top of the column. *Significant difference between 1999 and 2006 19A isolates (p<0.005).