Increase in Pilus Islet 2-encoded Pili among Streptococcus pneumomae Isolates, Atlanta, Georgia, USA

Zähner, Dorothea; Gudlavalleti, Aditya; Stephens, David S.
June 2010
Emerging Infectious Diseases;Jun2010, Vol. 16 Issue 6, p955
Academic Journal
To define the prevalence of pilus islet 2 (PI-2)-encoded pill in Streptococcus pneumoniae in a geographically defined area, we examined 590 S. pneumoniae isolates from population-based surveillance of invasive pneumococcal disease in Atlanta, Georgia, USA, 1994-2006. In 2006, PI-2 was present in 21% of all invasive isolates, including serotypes 1 (100%), 7F (89%), 11A (21%), 19A (40%), and 19F (75%). Only serotype 19F is included in the 7-valent pneumococcal conjugate vaccine that is in use worldwide. In 1999, PI-2-containing isolates were of the same serotypes but accounted for only 3.6% of all invasive isolates. The increase of PI-2 in 2006 resulted predominantly from the emergence of serotype 19A isolates of sequence type 320 and the expansion of serotype 7F isolates. The increase in PI-2-containing isolates and the finding that isolates of all identified serotypes expressed highly conserved PI-2 pill supports their potential as a vaccine candidate.


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